Simple test. Unplug the sending unit. If the reading drops the gauge is good. More than likely it's the sending unit. The higher the resistance the lower the gauge reads and vise a versa. There is a possibility of the gauge wire shorted to ground somewhere.
Check to see what the resistance is...
I don't think I have seen J55 on the tag. It will be on the window sticker and broadcast sheet. Just my 2¢.Take note, G11 G37, J54,J55. No J55 on tag From what I understand , this one has one of the rare options. M73
Rare options on this one.
$200+ for each crack! I just can't see it's worth it. The other thing do they back there work? If it were me I would attempt a make a repair myself. Then I would just live with it.
Do have a 3488764 three speed switch. In the off position on the switch, test the impedance between the B and P terminals. That should read 0 Ohms. The second test is between F1 and the metal frame of the switch. That too should read 0 Ohms. If both of those tests read correctly, then test the...