Quote: Has any of the wiring from the sending unit to the harness been changed, or messed with? The resistance wire might be missing, that is if a 70 model had that feature.
There are no resistance wires in a MoPar wiring harness.
My 71 has it, and it is in the wiring diagram in the service manual. Look at the 71 Hemi engine wiring diagram.
I asked Frank Badalson about this resistance wire I was talking about, and he said all 70-71s with rally gauges have this wire to insure proper pressure indicating system operation. So, there.
