When you replace the air pressure sensor behind the cab on these 769 cats. Do you have to reset the new sensor or can you just replace it and it should work? I installed a new sensor but the needle on my cluster does not raise even though I have plenty of air pressure because the parking brake does release.
There are 2 sensors, one for the gauage which has a resistor attached to it, and one for the brake release. You do not need to calibrate these
Figured out I was losing air at the AIR Dryer. JUst letting yall know