TRANS WONT SHIFT OUT OF FIRST AND THE SPEEDOMETER AND RPM GAUGE WONT WORK on 1999 Chevrolet 3500 Pickup

ALL FUSES ARE GOOD WHAT SHOULD BE MY FIRST STOP

Asked by for the 1999 Chevrolet 3500 Pickup
1 answer
did the trans stop shifting at the same time the speedo stopped working??

Roy