Tach quits working after driving a while. It doesnt stop working all at once. It gets slow first and then will drop to zero. If I stop the truck and turn it off and restart it, the tach works fine for a while. 117000 miles, 3300 hours. Any ideas? Its out of warranty.

 

Holy **** you do alot of driving. It could be a loose conection, or the windings of the tach(basicaly a servo motor) could be getting weak and increase in resistance when it warms up. That would cause it to work and slowly decrease to 0 as it warms up. You can get a new gauge cluster for about $350. Or even better find a wrecked D-max with only 20k miles on the odometer and swap it out. Then you'd even have your warranty again.

 

Smart man Snake. I would do the same thing.

 

Nice theory but the ECM has memory and the DIC is just a readout of the ECM. Therefore, any other instrument cluster would read what is truely on the truck unless the ECM was changed also, and then the VIN would be different than the truck.

 

So what you are telling me is if I put a differant guage cluster in my truck it will show the TRUE miles on the read out of the new cluster??

 

Thats what I understand.

 

negative.

why do people get those escalade clusters reprogrammed with the correct mileage then?

 

Exactly. Cause I have Escalade guages in my truck and i switch my clusters from time to time and the both read differant.