Temp & fuel gauges - what am I overlooking?

Think about this. This talk about "checking" the gauges by grounding the sender wire, might be fine for a quick check to see if it might work

But "let's say" both gauges were damaged by a bad limiter, even one that stuck temporarily and overheated the gauges. it just might be that the gauges are so effed up and innacurate that they actually don't hardly work. This is why I keep harping for an "end to end" check. First test the cluster with resistors, Then into the car, and check power to the cluster UNDER LOAD to be sure that part is OK, and don't forget to ground the cluster.

Then recheck operation with the test resistors at the sender wires, and if that does not work, backtrack to the gauge sender studs, and connect the test resistance there to ground and retest.

Also keep in mind that ANY electronic device can fail or be defective. For all I know the new RTE is not putting out properly

Does RTE have a test procedure? I've never looked.