I have a 1991 lx v8, and am trying to wire a custom fuel gauge. It is with the Holley hp efi system, but it’s not getting a reading. I have the yellow/white wire from the dash connector wiring into it and it is setup as a custom ohms input, but does not display a read out, meaning ♾ ohms, because it reads as 100% full no matter the scaling or boundaries. I have tried looking at wiring diagrams for the sender but I can’t figure it out. I assume the sender is grounded on its own away from the dash cluster connector, but I could be wrong. If anyone could help, it would be much appreciated.