Why tachometer quit working while driving on bumpy road got erratic then quit working at all 2005 z71 suburban

SOURCE: When driving my oil pressure gauge and tachometer does not work

if its not a fuse check the speed sensor for the tach, and the oil pressure switch on the side of the engine block see if the lead came loose

SOURCE: clutch on compressor will work sometime than quit

There is no interrupter switch on the a/c system. The only reasons that the clutch wouldn't engage is
1.- there is a short in wire to clutch
2.- the freon level is to low
3.- the low side pressure switch has failed
4.- the compressor clutch is going out
Hope this helps you get this problem taken care of. Good luck.

SOURCE: What to do since my

You will need to bring it to a dealer or tire service center to see what the problem is.Most of the time it will be a sensor.Sometimes they can be just relearned.Also you may want to check your tire pressures.Make sure they are pressurized to what the pressure says on your door placard.