What you need to do is actually look at the cluster. If you can post a clear photo (or split and do overlapping 2 photos) of the back of the cluster you can follow where the traces go.
Also if you look at the factory diagrams, there are charts behind the diagrams showing the connectors..
If you do not have a copy of the 74 factory manual I made a pdf of the wiring section that you can download........
https://www.forabodiesonly.com/mopar/attachments/74vlwirings-pdf.1715779008/
EDIT that page somehow got AFU
here
View attachment 1715798182
From here you have to get back into the factory diagrams and figure out what the wires do OR trace the traces on the cluster directly.
G2, violet, and G6, grey, for example are sender wires, one is temp one is oil that MIGHT be in the Painless manual
E2, Orange--Orange is almost always dimmer controlled dash lighting
See table 9-1 on page 21 of the Painless manual
