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

The blue should be hot with the key in 'run' It is switched ignition. Are you saying it has no power at the wire, or at the PC board. Suspect the PC board pin and harness connector
none at the wire (or anywhere I can trace the wire back-which seems to be to that relay above the kick panel...
edit- no power at the other side of the relay (I guess that's what it is) with the two blue wires going in either.

btw, I ran a wire from a keyed spot directly to the hot side of the IVR, and that makes the gauges work.