I just took the go-cart back out for a spin after some significant downtime doing various things. One of those things was a new Boyd Fuel tank. I bought the matching 0-90 ohm gauge from Autometer, reference P/N 1904 per recommendations/guidance I found on this forum. Tank is about a quarter full right now.

When I turn the car on the gauge needle just blips above empty. If I unhook the wires at the sending unit, the gauge goes immediately to full. This tells me the wiring is not grounding out to the sender but most likely somewhere in the sender itself. Additionally, I had the stock factory five fuel tank, sender and gauge before and it all worked fine.

If I keep the ground removed and just touch the green wire, the gauge immediately returns to 0. If I install the ground the same thing happens. If I swap the green and ground wire the same thing happens. If I ground directly to chassis instead of the wiring harness, same thing happens. No matter what I do, when connected, the sender does not appear to be working.

Suggestions? Bad sending unit came with my tank maybe? I have reached out to Boyd but just checking here in case there's a secret sauce I'm missing.