I working with a new wiring harness made for this application. I wired the Temp Gage with a jumper to the Fuel Gage as the harness instructions required.
The Fuel Gage has 3 posts. The Manual's Wiring Diagram shows a hot wire, a sending unit wire and a "instrument voltage regulator" (I think that was the terminology) wire or post.
The Fuel Gage is not legibly marked to show which post is which, so I tried different combinations , without success.
BTW, I have a '57 instrument cluster, and it has 2 posts on the Fuel Gage, with what I believe is a resister attached to one of the 2 posts.
Will someone straighten me out, please?