Tach and speedo won't work

#1

Hi, my 1998 GMC serria 4x4 has a problem. The seedometer, tachometer, and gear indacator light on the dashboard all won’t work. It also seems slugish when I step on the gas and won’t shift into overdrive. I checked the fuse in the door and it seems to be working. Any ideas what could be wrong would be helpful. Thanks.



Brian Potter

Lansing, MI

#2

Please clarify. Do you mean that the speedometer lamp, the tachometer lamp, and the gear indicator lamp don’t light? Or, do you mean that the speedometer gauge doesn’t indicate speed, and neither does the tachometer gauge show rpm? And, the gear position indicator lamp doesn’t light? Our answers are dependent upon your answers.

#3

Is the ‘Check Engine’ light on?