Wacko Dash Guages And Non Working Fuel Gauge

[motorcoachdoug]

I have a 97 GMC C1500 6 cyl with 225,632 miles on it. I hit a pothole the other day and the service engine soon llight came on. THe computer said I had to replace the MAS and Throttle body sensor. Replaced them both. and had the computer codes cleared from the computer. Now the codes are back and now it says also I have to change the MAP sensor as well. Also it says the codes for the MAF sensor the resentice is both high and low. My truck is running very rich and when driving it sometimes will hesatate while driving and at idel the motor will knock as well.

 

Dash gauges ,fuel,volt,temp and oil pressure are not working also. MY Tac is off and my spedo is off by 5mph as well.

 

Any ideas???

Thanks for your help

Doug