Need a picture of the cluster harness or "wire diagram"

Strange, the standard 1994 F355 Euro-spec wiring diagram shows all 7 pins in use.

Sorry, no photos, but looking at the standard wiring diagrams, I built up the following list...

1) Grey/Black (Oil Pressure signal ("COM"/needle). A variable resistance)
2) Yellow/Red (backlighting for both instruments (positive 12v))
3) Grey/White (signal for water overtemp light)
4) Green/White (power for overtemp and oil pressure lights, I think)
5) Grey/Yellow (signal for oil pressure warning light)
6) Black (common earth for backlighting and water temperature)
7) Grey (water temperature signal ("COM"/needle), a variable resistance)

Does anyone know if the F355 oil pressure transmitter (P/N 135940) sends two different signals (pressure and warning signal)? Or does it just send pressure and the instrument computes if the pressure is bad. This might explain why two of the pins are not used on this composite instrument.

Thanks

Cheers
Ian.

 

Ugh... Sorry, I didn't realise the F1 was so different from the Euro gated manual. I have the clock, fuel gauge and oil temperature grouped together near the radio on the Euro-spec gated car. The oil pressure is in the main instrument binnacle on the gated car. When you said "by the radio", I thought perhaps you had to get power to the main instrument binnacle via the radio (due to main instrument binnacle wiring differences).

Are your intentions to leave the instruments where they originally were on your F1?

At this point in time, I'm not sure if we should go back to the basics, or look for someone who has done this modification before. There doesn't seem to be too many ways you can hook up the gauge in your picture, so, as you say, there may be gauge operating differences (perhaps different scaling or it may even need a third wire as shown in the diagrams).

I'm not sure if photos of the wiring on a manual car would help (unless the actual wiring is different from the wiring schematics)

Cheers
Ian.



P.S. For what it is worth, for the oil temp/fuel quantity/clock, the 1994 manuals show a 6 pin plug:

1) Orange (clock)
2) Yellow/Red (backlighting for all 3 instruments)
3) black (common return)
4) violet (or purple) Fuel quantity
5) brown (Oil temperature)
6) green/white (Oil temperature power)

 

Your airbag light is now on because the harness was unpluged (for the bulb) and you turned on the key.

 

Excellent. Well done.

Makes sense. The indications are resistance based and you have two indicators in parallel, affecting the resistance.

I don't see any (rectangular) warning annunciators on my car for oil, but I do see an unused annunciator on the left side (bottom light). Perhaps this is the one used on the F1?
Perhaps the warning light circuitry is not as critical as the dial circuitry and you can have both lights working (but don't quote me on that )

Anyway, sounds like you're making progress!

Cheers
Ian.