I've read all I can on the subject. My 260 gauge reads close to the red. I have checked temp with IR gun and it's about 195-200. I have tried to calibrate the gauge using resistors from 10-39 ohm with no change. I have run a dedicated, but temporary ground for the gauge, no change.
I'm wondering if the gauge can be defective inside and non-calibratable. Has anybody found this to be true by just changing the gauge and improving their readings?
Asked another way, just because the gauge moves, is that proof it must be good all around?