Need Gauge help. Thanks

Didn't say how your fixed the "voltage limiter" inside your fuel gage. BTW, 1965 did have it inside the gage too. You probably cleaned the contacts. If going to that effort, it might be better to disable it. I slid heat shrink over the contacts. Instead, I installed an external electronic limiter, which is adjustable (~$30, search "Plymouth" & "voltage limiter" on ebay). In my 1964 Valiant, I did bench tests, tweaking the +5 V so the temp gage read correctly (using test resistors) and added parallel resistors so the fuel gage read correct at the limits of my new sender. This was with sender on the bench, so might vary slightly as-installed in tank. There are also adjustments on the needle holders for zero and span, but a bit tricky and I expect just for factory tweaks and not detailed in the shop manual.