73 Dart Swinger Instrument Cluster

Doesn't the 73 have the "more Valiant" style cluster? If so you can easily make that into a custom gauge mounting. The older Darts are a PITA to do that

There are hundreds of threads on here to fix the originals. You might as well yank the cluster out and "go through" it

You need three resistors to duplicate the factory test jig.
Download yourself a free shop manual from MyMopar, some of which over there came from the guys on here

MyMopar - Mopar Forums & Information - MyMopar Tools/Reference

Gauge tester resistances:

c-3826-jpg-jpg-jpg.jpg


Read this stuff:

How to test unknown fuel gauge.

Printed circuit pins repair

"Stuff" that can go wrong and was wrong with my cluster:

Circuit board pins broken or loose
IVR bad
IVR contacts not making contact with PC board traces
Gauge studs not making contact with board. "Work" nuts loosen/ tighten and replace nuts

External wiring can have problems, the fuel goes through the left kick panel connector, the oil and temp goes through the bulkhead connector
The sender connectors can be bad/ loose / corroded
The fuel sender might not be grounded