Fuel Pressure to Input Question

[Howedeman]

I have installed an electric fuel pressure gauge that I also want to log. Ive set up the scanner to read the correct values but not sure which wires to hook up. It is an autometer gauge that has 4.5 volts going to sensor as grey wire, the return voltage as purple, and ground as black. I want to keep the gauge as well. Do I just t into the purple wire and put it on one of the 1-4 terminals and ground on the 5-8, or do I just need the purple wire since it is the varing voltage.

[Howedeman]

Well I hooked up the purple wire as input 2 and black to 6 and it works.

[jimmyb496]

From reading the forums on this topic quite a bit today, you can run your ground wire to good ground source on the car. It doesn't nessicarily have to be grounded to Pin 5 or 6 on the interface.

If you already had your FP gauge installed and wired, thus the sending unit would be grounded already, you just need to connect the purple wire to Pin 1-4 on interface.