After welding a fitting into the sump and getting the correct sensor for this 7 series oil temperature guage I discovered it doesn't work. It turns out the circuit board on the back has a piece broken off, I think that piece has two resistors on it, I can easily solder some resistors on where the bit of board was but I need to know what they were and how they were wired up. If anyone has a photo of the back of one of these gauges in good condition that would be appreciated.

