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Owner's Manual — Rev 1.0
S2KConverter
Honda S2000 Instrument Cluster Adapter
01Overview
▼
The S2K Converter translates the signals from your source vehicle into the exact signals expected by a Honda S2000 instrument cluster — coolant temperature, fuel level, and vehicle speed. Every unit ships pre-configured with defaults for both AP1 and AP2 clusters. Select your cluster type in the Settings tab and you're ready to go. Fully configurable over Wi-Fi from any phone or laptop.
| Parameter | Value |
|---|---|
| Cluster Support | AP1 (2000–2003) and AP2 (2004–2005) |
| Power | 12V ignition-switched. <200mA idle. |
| Configuration | Wi-Fi access point — connect at 192.168.4.1 |
| Speed Input | VSS pulse signal, 5V compatible |
| Coolant Input | ECT sensor resistance (Honda compatible) |
| Fuel Input | Fuel sender resistance |
| Settings | Stored on-device — survive power cycles |
02Installation
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Plugs directly into our harness — no cutting, crimping, or custom wiring required. Installation takes a few minutes.
DEDICATED COOLANT SENSOR REQUIRED
The S2K Converter requires its own dedicated coolant temperature sensor — it cannot share the sensor already connected to your ECU. Using a shared sensor will produce incorrect temperature readings due to conflicting pull-up circuits. Install a separate NTC coolant sensor for the converter before proceeding. This sensor is not included.
01
Plug in the harness
Connect the converter to the harness using the keyed connectors. Press each connector until it clicks.
02
Turn the ignition on
The module boots in approximately 2 seconds, closes the cluster relay, and the S2000 cluster illuminates. No further steps required before first use.
03
Connect to Wi-Fi and verify
Connect to S2000-Cluster (no password) and open 192.168.4.1 in a browser. Check that each tab shows a live reading.
If your phone warns "No internet" — tap "Stay connected." The config page loads without internet access.
K Tuned Connector Users
If your harness has a K Tuned connector, a small modification is needed first. Watch the install video for a step-by-step walkthrough.
► Watch Installation Video
03Coolant Temp
▼
Shows a live reading from your coolant sensor and lets you set the thresholds that control when each segment of the temperature bar illuminates. Default thresholds for both AP1 (6 segments) and AP2 (20 segments) are pre-loaded — select your cluster type in Settings and the correct defaults load automatically.
⚠
DEDICATED SENSOR REQUIRED. This tab reads from a coolant sensor wired exclusively to the S2K Converter. Do not share the sensor with your ECU — doing so will cause incorrect readings for both the converter and the ECU.
S2000 Cluster
Configuration
live
Coolant
Fuel
Speed
Settings
Live — coolant temp
CH
Sensor Reading
2141
Segments
4
Thresholds
What is the Sensor Reading?▼
A number between 0 and 4095 derived from your coolant sensor's resistance. On a cold engine it will be high — typically 2500–3500. As the engine warms up the number drops. A fully warm engine typically reads 1400–2000 depending on your sensor. If the reading is stuck near 4095, the sensor wire may be open or disconnected.
How do thresholds work?▼
A segment lights up when the Sensor Reading drops below its threshold value. Seg 1 is the first segment (coldest end of the bar). With the default thresholds loaded, Seg 1 activates once the engine has warmed slightly from cold, and each subsequent segment lights as the engine gets hotter. AP1 clusters have 6 segments; AP2 clusters have 20.
How to calibrate step by step▼
Connect to the interface and watch the Sensor Reading as the engine warms from cold. Note the reading at the moment you want each segment to light. Set that segment's threshold to that value. Thresholds must always be in descending order from Seg 1 to the last segment. Tap Save to device when done.
Gauge stuck at cold — how to fix▼
If no segments light even when the engine is warm, your Sensor Reading at operating temp is higher than your Seg 1 threshold. Lower the Seg 1 value until it's below the warm reading — the segment will then activate. Work through each subsequent segment the same way.
04Fuel Level
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Shows a live reading from your fuel sender. Default calibration for both AP1 (21 segments) and AP2 (38 segments) is pre-loaded — select your cluster type in Settings first. Because different vehicles use different sender resistance ranges, fine-tuning the calibration is almost always required. Use the 5-point grid or Auto-learn.
S2000 Cluster
Configuration
live
Coolant
Fuel
Speed
Settings
Live — fuel level
EF
Sensor Reading
1630
Segment
11
Calibration
Auto-learn
What is the Sensor Reading?▼
A number between 0 and 4095 representing your fuel sender's resistance. On most Honda senders, higher reading = more resistance = less fuel. A full tank typically reads low (200–500) and empty reads high (2500–3200). If your readings are reversed, see the backwards gauge note below.
5-point calibration — step by step▼
Fill the tank completely and note the Sensor Reading — this is your Full value. As you drive and the tank empties, note the reading at roughly three-quarter, half, and quarter tank. Note it again when nearly empty. Enter these five values from left (Empty) to right (Full) and tap Save. Values must be in descending order — Empty highest, Full lowest. The converter interpolates all 21 segments (AP1) or 38 segments (AP2) from these five points automatically.
Auto-learn — step by step▼
Tap Start to begin a session. Drive until the tank is as low as you're comfortable letting it get, then tap Set Empty. Fill the tank completely and tap Set Full. Tap Commit to save. The converter calculates all calibration from your actual readings. You can fine-tune with the 5-point grid afterwards if needed.
Gauge reads backwards — how to fix▼
If the gauge shows full when the tank is empty, your sender's resistance range is opposite to the defaults. Run Auto-learn — it captures your actual Empty and Full readings and calibrates correctly regardless of which direction your sender works.
Normal Mode
5-point calibration grid. Enter Empty and Full at minimum, then add intermediate points over time for better accuracy.
Advanced Mode
Individual threshold box for every gauge segment. Use only if the interpolated thresholds produce uneven segment spacing. Enable in Settings tab.
05Speed Signal
▼
Shows live input and output frequencies. Set a correction factor to scale your VSS signal to what the S2000 cluster expects. A sensitivity slider controls how quickly the display responds to speed changes.
S2000 Cluster
Configuration
live
Coolant
Fuel
Speed
Settings
Live — speed signal
VSS In
17.1 Hz
Output
633 Hz
Correction Factor
37.00
Correction factor
Default: 37.00
Response sensitivity
15%
VSS In and Output explained▼
VSS In is the raw frequency from your vehicle's speed sensor. Output is the frequency sent to the S2000 cluster after multiplying by the correction factor. At 30mph on most EK/EG platforms, VSS In should be approximately 33Hz.
How to calibrate the correction factor▼
Drive at a steady, known speed — 30mph works well. Compare the cluster reading to a GPS speedometer app on your phone. If the cluster reads too high, lower the factor. If it reads too low, raise it. Small changes have a large effect — adjust in increments of 0.5 and re-verify. The default of 37.00 is a good starting point for most Hondas. If you have a K swap with a countershaft speed sensor using High Freq mode, your correction factor will be close to 1.0 — start there and fine-tune in small steps.
Response sensitivity explained▼
Controls how quickly each new speed reading influences the displayed value. At 15% (default) the display is stable and smooth — good for daily driving. Raise to 30–40% for faster needle tracking during hard acceleration. Lower below 15% for an extremely steady display that changes slowly.
06Settings
▼
Controls cluster type selection, advanced mode, and factory reset. Set your cluster type first — everything else loads from that selection.
S2000 Cluster
Configuration
live
Coolant
Fuel
Speed
Settings
Cluster type
AP1
AP2
Updates coolant thresholds, fuel gauge segments, and displays.
VSS input mode
Low Freq
High Freq
Low Freq: EK / EG / DC. High Freq: K Swaps with 05+ Transmission
Advanced mode
Exposes per-segment fuel thresholds on the Fuel tab.
Device info
Wi-Fi
S2000-Cluster
Firmware
1.0.1
Restore defaults
Resets all calibration to factory values.
Cluster type — AP1 vs AP2▼
Select AP1 for 2000–2003 clusters or AP2 for 2004–2005 clusters. Both sets of default calibration values are pre-loaded on every unit. Switching cluster type loads the correct defaults for coolant thresholds and fuel segment counts (AP1 = 6 coolant segments, 21 fuel segments; AP2 = 20 coolant segments, 38 fuel segments). Always set this before calibrating fuel or coolant. If you switch cluster type after calibrating, you will need to recalibrate.
VSS input mode — Low Freq vs High Freq▼
Controls how the converter reads your vehicle's speed sensor signal.
Low Freq — use this for EK Civic, EG Civic, and DC Integra platforms. Correction factor will be around 37.
High Freq — use this for K Swaps with a high frequency VSS and similar platforms whose speed sensors output a frequency much closer to what the S2000 cluster expects natively. Correction factor will be close to 1.0. If your speedometer reads zero in Low Freq mode on your K Swap, switch to High Freq. Changing modes resets the speed display automatically.
Low Freq — use this for EK Civic, EG Civic, and DC Integra platforms. Correction factor will be around 37.
High Freq — use this for K Swaps with a high frequency VSS and similar platforms whose speed sensors output a frequency much closer to what the S2000 cluster expects natively. Correction factor will be close to 1.0. If your speedometer reads zero in Low Freq mode on your K Swap, switch to High Freq. Changing modes resets the speed display automatically.
Advanced mode▼
Once enabled, the Fuel tab shows individual threshold boxes for every segment instead of the 5-point grid. Persists across reboots. Use only if the standard calibration produces uneven gauge spacing.
Restore defaults▼
Resets coolant thresholds, fuel calibration, speed correction factor, and sensitivity slider to the factory defaults for your selected cluster type. Cannot be undone. Your AP1/AP2 cluster type selection is preserved.
07Firmware Update
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Firmware updates are installed directly through the device's Wi-Fi interface — no USB cable, no laptop software required. Download the latest firmware file, connect to the device, and upload it from your phone or browser.
01
Download the firmware
Download the latest firmware file below. Save it somewhere you can find it — your Downloads folder or desktop works fine.
02
Connect to the device
Turn the ignition on. Connect to S2000-Cluster Wi-Fi (no password). Open 192.168.4.1 in your browser.
03
Open the update page
Go to the Settings tab and tap Update Firmware. This opens the firmware update page at 192.168.4.1/update.
04
Select and flash
Tap the upload area and select the .bin file you downloaded. Tap Flash Firmware. A progress bar will appear — do not close the page or disconnect during the upload.
The upload takes approximately 20–30 seconds. The device will reboot automatically when complete.
05
Reconnect and verify
After the reboot, reconnect to S2000-Cluster and open 192.168.4.1. Go to Settings — the firmware version shown in Device Info should reflect the new version. All calibration and settings are preserved across updates.
Will my settings be lost after updating?▼
No. All calibration and settings are stored in non-volatile memory separately from the firmware. Updating the firmware does not erase your coolant thresholds, fuel calibration, speed correction factor, or sensitivity settings.
The page lost connection during the upload▼
This is normal if the update was successful — the device reboots and drops the Wi-Fi connection as part of the process. Reconnect to S2000-Cluster and check the firmware version in Settings. If the version updated correctly, the flash was successful. If the version is unchanged, try the update again.
The update failed — what now?▼
If the update page shows an error, the device has not been flashed and is still running the previous firmware normally. Check that you selected the correct .bin file, that you stayed connected to S2000-Cluster throughout, and that your phone did not switch to mobile data mid-upload. Then try again.
08FAQ
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The speedometer reads correctly at one speed but wrong at another.
The correction factor is a fixed linear multiplier — if it reads correctly at 30mph it should read correctly at all speeds. If VSS In is fluctuating at steady speed, there may be electrical noise on the speed signal wire.
Speed display takes a moment to update from a stop.
Normal behaviour. The converter needs two clean pulses to compute a valid reading. At very low speeds this takes slightly longer. Once moving at any normal speed the display updates within a fraction of a second.
Fuel gauge shows full when empty, or vice versa.
Your sender's resistance range is opposite to the defaults. Run Auto-learn in the Fuel tab — it handles any sender direction automatically.
Coolant gauge stuck at cold even when warm.
Watch the Sensor Reading in the Coolant tab as the engine warms. If it decreases but never crosses the Seg 1 threshold, lower the threshold until it triggers. Repeat for each segment as needed.
My phone says "No internet" on S2000-Cluster.
Expected — the converter's Wi-Fi has no internet access. Tap "Stay connected." The page at 192.168.4.1 loads normally.
Settings reset after a power cycle.
Settings only save when you tap the Save button. Viewing a tab does not save values — you must explicitly save after making any changes.
Can I use a 2006+ AP2 cluster?
No — the 2006+ AP2 uses a CAN-based signal protocol and is not compatible with this converter. Only AP1 (2000–2003) and AP2 (2004–2005) are supported.