Diagnostic port for level sender, which one?

[CactusS4]

I've been lagging and driving my car without the level sender plugged in, since day one the system would not recognize it. I've gotten off my arse now and want to check the voltage, and it appears that the diagnostic ports should allow me to get the required information to know if this is a defective sender or something else.

So which test port, I can check it with my voltage tester

Thanks

[Richard L]

number of things to check first:

1. The wire orientation of blue harness is red, yellow, blue and black. (red is the guage side)

2. Check the wire colour of the level sensor at the tank end, it should be yellow and green.

Once we have established the abovem,, we can investage further from the controller end.