engine temp sensor specs

Should be the same for fuel and optional oil gauge. Mopar used to sell a tester that had three resistors inside, which simulate empty/ cold, middle of scale/ half tank, and full/ hot mark

All you need to do is scare up the resistors, from someplace like Mouser Electronics. I did mine this way because I have a "junk box."

http://www.forabodiesonly.com/mopar/showthread.php?t=179517

The basic resistances are

L = 73.7 Ohms (empty)
M = 23.0 Ohms (1/2)
H = 10.2 Ohms (full