It started by working now and then mainly inthe mornings, now the mileage dislay quite working period. fuses are ok I even replaced them just to see if it would work, nothing.
digital mileage display stopped working on 1999 GMC Sonoma
This problem is in your cluster. You can have the cluster repaired at SpeedoTach in Concord CA. You can remove it and FedEx it to them. They do all the GM dealership work and they are very reasonable. Google them or ask 411 for information in Concord, CA ask for SpeedoTach.