Trying to program an Autometer Cobalt fuel level gauge and it isn't going well. What the hell am I doing or not doing right? Here is what I got so far.

Red wire = 12v This is good and gauge has power.
Black #1 = Engine/chassis ground. This wire is good.
Yellow = lighting. This is good!
Brown & Black #2 = programing wires, they are good.
Purple = signal wire, not working right.

I used a meter and checked the ohms coming from the in tank sender and they are good. However I get no reading from just the purple wire. I only get a reading when I use the meter on the purple and the black with gray stripe wire. The directions say to run the purple signal wire to the signal wire of the sender. Which to my understanding is the purple one.

Why is this not working? The gauge goes through all the steps but fails to read proper fuel level at the end so I always need to repeat it and it just won't work.

Pics:




The arrows are the two wires I use to get the proper ohm readings from. What am I screwing up?

 

Anyone?

 

Also the purple wire is cut and directly connected to the gauge so there is no PCM connection to the sender.

 

I put the meter on the purple wire and got nothing. For the hell of it I did it to the other wires as well and nothing. The only time I get the right reading is when one lead is on the purple wire and the other lead is on the black w/gray stripe wire as in the pics. 40 ohms empty and 250 ohms full. This is really starting to confuse me. Any ideas what the problem could be?

 

The Black and gray is probably the ground wire for the sending unit. Get both to complete the circuit. Thats all you need. I just grounded mine to the firewall. Works great.

 

Are you saying cut the black and gray wire then ground it to the chassis?