Temp & fuel gauges - what am I overlooking?

Also, are you aware of the common failure of the IVR contact fingers in the board? The springy fingers that you plug the IVR into sometimes lose contact with the traces. You must solder jumpers across between the fingers and the traces. I hope you also know about the same thing between the harness connector pins and the board. Clean them, use rosin electronics flux, and solder with electronic/ rosin solder, NOT acid "plumbing" solder. I do NOT recommend any "lead free" solder of any type