I've got a SPI temp guage (used) so it didn't come with any instructions.

I've got 4 wires, white, black, green and red.

I hooked up the white and black wires for the dash light, that seemed to work fine with the dimmer.

So I think that the green and red wires are for 12V and the temp sender. Well with that set-up the guage works only the with the park lights on.

So I try playing around with the wires to see what will make everything work and I get more confused. I can wire it up and get different temp readings.

I need a diagram. Any pointers?

Thanks,
Jeff

 

I don't have an SPI.

I have a DEFI.

5 wires
Red: 12V
Black: Ground
White: Illumination
Orange: Ignition

And a separate temperature sensor.

That mens your white is either illumination or ignition. Since you tried it as illumination, try it on the ignition. Maybe it always lights.

 

Nevermind.

If you didn't see it allready, go here