oil P. and speedo wiring.

[Harrison01]

OK then ill try to keep this simple.

The oil p. gauge. do the clocks send a 12v signal to the oil p sender then earth itself out thriugh the clocks giving a signal?

Or do they work a different way.

The speedo. out of the 3 wires i assume that there will be an earth (bare wire), a 12v permanent (red?), and a pulse signal back to the clocks (whatever the 3rd colour is).

Or do they work differently also.

all help as always appreciated.

[Scoff]

Hi, both things work different to how you describe.

The oil pressure and warning lamp sender switches to earth - they have no live feed. the sender varies its resistance to block earth, the lamp just switches to earth in cases of low pressure.

The speedo sensor is a VR sensor, it does not make a pulse like a hall effect or optical sensor would. the outer screen is earth, the red and white wires go to the sensor. it works in the same way as your crank angle / TDC sensor does, incase that helps you understand it.

[Harrison01]

cheers scoff, got the oil pressure working, got too cold to do anymore.

how can i get a 12v signal coming to the clocks to light up the warning light from the handbrake and choke.

any help.