Yes you can convert those from negative to positive ground. you need flip the coil wiring.
The applies for a gauge going from negative to positive or positive to negative.
check your gauge as coils in the below are top and bottom but you can just look at wiring and determine which one is which based on which one is wired to case vs pins.
This was written up for a guy converting a British car but still applies.
i know several guys that used this to go from positive to negative. you would just his instructions backwards on negative to positive.
Please post a picture of your gauge from the back that you want to convert.
Get the instructions with pictures below link as it applies to any coil type fuel gauge. Yes its a boat car but his writeup is excellent and like i said a few car buddies of mine who love restoring British cars use it to convert to negative ground because of the electronics and his other explanations like not blowing up phone chargers. Your just doing the same thing on a negative ground gauge.
https://www.amphicars.com/tech/default.htmlFuel gauge section is about halfway down the page. under his tech section.
if you find a NOS that would work to like posted above and play with one of the gauges you bought
