so if the gas and temp gauges don't work...

God dammit. I explained this to you READ what I posted

N is going OUT to the engine. This is "ignition run" from the switch going out into the bay


Somewhere on the interior, between N and the ignition switch connector is splice "diamond 3" in that diagram.

Power comes FROM the ignition switch on the IGN1 line. Read my post above, again.