You guys know more about this than I. Two observations that may be relevant.
1. When I tested the gages with a contant voltage source of 3.1 to 3.2 Volts, the pointers all swung 7/8 full scale.
2. Same gages connected hooked up on the circuit board with 22 Ohm resistors substituting for sending units, went to 1/2 scale. The analog multi-meter showed the IVR output pulses to swing from zero to 4+ Volts at most when read on the 15 Volt scale. I have a beat up analog meter that might have a 0-10 scale. If so, I'll retest.
My takeaway is that a 5 V constant may not have the same effect on the resistance wire and gage movement as the pulsing IVR.
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