Speedometer and Odometer Conversion
Background info.
All Japanese imported cars will read in kilometers per hour (KPH) but to be legal in the UK you need to convert this to miles per hour (MPH)
TRL Performance sells speedo converter boxes and provides technical assistance for any installation
Actually, you don't need to convert it to be legal on the roads in the UK if you have personally imported the vehicle. If you purchased this from a dealer and it was done via a commercial import route then this should have been done for you already This normally only means you have a speedometer that reads in MPH and I have tried to help in providing information how to alter the odometer and get all those goodies like cruise, active spoiler and speed limiter sorted out.
Here's the technical details of what's going on
Conversion Procedure. ( Here's the Schematic!)
The modifications and procedure to make the speedo and odo' read in MPH are as follows..
Remove the speedo head,
Remove the BLUE connector, C13, from the far left of the speedo head,
Locate the 5th pin, it's the BLUE WIRE
with RED STRIPE and SILVER BANDS,Leave yourself plenty of
wire to work with at the connector end and CUT this wire.
(That is the main speed signal from Speed Sensor No.1)
Connect the INPUT terminal of your speedo conversion unit to the wire on the harness/loom side (not the connector side)
Connect the OUTPUT terminal of the
conversion unit to the wire stub left
connected to the connector.
(That's the speedo signal bit sorted!)
Now you need power.
12V for the conversion unit can be found on pin 4. Splice a connector onto this wire and 'T' off for the power to the converter.
0V can be sourced from any
chassis point. There's one just behind the speedo
head, a screw.
Remove connector T7, this is the one connected to the far left next to the hazard warning light switch and should already have been removed to do the above.
Locate pin 5, again a BLUE WIRE with RED
STRIPE and SILVER BANDS.
(This is exactly the same as the speedo head wire but we
need to modify it
because the signal from speed sensor No.1 is 'T'd earlier
on in the wiring
loom and so the speedo mod will not affect it.)
Again make sure you have enough wire left over at the
connector end and CUT
the wire.
Now connect a NEW piece of wire from the
output of the speedo converter to
the wire stub of the connector T7.
Now the speedo' and odo' will measure
speed in MPH and not KPH.
But how do I get the odometer to display MILES and not Km ? You've got two options....
Final Notes:
I hope this encourages others to have a play and get both the odo and speedo converted.
For further assistance and prices regarding the TRL DSC (Digital Speedo Converter) contact TRL via Email at dsc@trlperformance.com
Note: The TRL DSC provides calibrated outputs adjustable by +/-10% in approx 1.5% increments. It also provides a 1:1 and 5:8 scaled output signals plus a dedicated speed delimiter output. So THREE funtions in ONE box!
Copyright Temporal Reality Ltd 2000/1/2
