Don’t want to pay £40+ to go faster and already got your Speedo converted to mph - then read on……

Tools required

Cross head screwdriver

Length of wire

In line crimp or choc bloc

Cutters

This procedure was carried out on a 1995 2.0 GPX without ABS or TCL with 180mph speedometer face and the kmh to mph converter fitted to the back of the speedometer.

  1. Remove LH side kick plate by gently prising upwards
  2. Undo passenger LH lower plate by unscrewing the capped bolt at the front then from the middle of the plastic section gently prise from the bottom and slide back (this is the bit that the Hoops are on).
  3. Locate the Engine ECU and the required connector, it is the lower forward most connector. Remove the connector carefully and locate a yellow and white wire (mine also had a silver spot on it) and it is the 5th pin of the connector with no wire above. Note: There is another yellow and white wire on the lower connector nearest the door it is not this one!!!
  4. Drop the steering wheel to its lowest position.
  5. Remove the Speedo console surround by undoing the two securing screws.
  6. Remove the four retaining screws and pull out the speedometer console completely and locate the black box converter on the rear of the Speedo. There is a circuit track that comes in to the Speedo that is cut and each side of the cut there is a wire going to the black box. The wire coming from the main connector before the cut is in kmh feed from the gearbox sensor and the wire after the cut, nearest the Speedo center screw, is the converted signal from the black box in mph.
  7. The kmh feed wire is the one we need to interrupt to the engine ECU and feed it from the mph signal - (so unless your car can do 180mph+ the engine ECU thinks you are going a lot slower). It is important to interrupt the wire only at the engine ECU and not at the speedometer end or the feed to the INVECS ECU and gear change points are going to get screwed.
  8. Feed a length of wire across the floor of the car behind the centre console and up into the Speedo recess hole.
  9. Solder this wire to the mph feed - (blue wire from the black box on mine), but it is the circuit track running from the SP+ post. If you don’t have a soldering iron or don’t feel confident using one simply unscrew the SP+ screw and make a loop and wrap around the screw before tightening.
  10. One end done.
  11. Re-assemble the Speedo console by reversing 6,5 & 4.Not forgetting to lock the steering column.
  12. Now be brave - at the engine ECU cut the yellow and white wire (found in step 3) as far away from the connector as possible but leaving at least 20mm from the loom - just in case it all goes wrong and you want to reconnect it. Tape off the wire end coming from the wiring loom and strip about 5mm of insulation from the connector wire end. Now crimp or use your choc bloc to connect your mph wire coming from the back of the Speedo black box to the connector end wire. Re-insert the connector.
  13. Reverse steps 1 & 2 and tuck the wire away behind the floor carpet.
  14. You can now go as fast as the car will let you - I don’t have any mods at all and on the first test (off road of course) got 127mph those out there with induction kits should be laughing.

 

This information is provided free of charge and is not an incitement to speed - remember someone loves you and bent FTOs are not a pretty sight.

Many thanks to Keith from Basingstoke UK for the information in the Water witch Odihan at our last mini meet.

All information is believed to be accurate and worked for me - no responsibility for damage in the fitment of the modification or afterwards is accepted.

 

19/3/03