Instrument Cluster

[tanis4457]

You can do better than that for testing. Chrysler used to make a gauge test tool, which is basically 3 resistors in a box, to simulate MT or low, middle of gauge, and hot or full. The resistors are + /- a few ohms

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

EG for middle, you (used to) be able to go to Radio **** and buy a pack of 4 100 ohm 1/2 watt resistors. Wire all 4 in parallel, this makes 25 ohms. Connected from sender terminal of gauge to ground, this should give you 1/2 scale on the gauge. Leave it a couple minutes to settle down, and hold the cluster "as if" it were angled in the vehicle.

When i did avionics electronics we used decade boxes probably the same thing chrysler used. Do you have test resistances for the temp gauge? I'll add those and the fuel resistance points to my notes.

 

[67Dart273]

The gauges are same and senders are same resistance. So is oil gauge in a ralley dash

Some decade boxes may not handle the current.