RPM Gauge not working

[LowandUseless]

I have a 99 Silverado 1500, recently my RPM gauge suddenly stopped working. The Speedo, gas, volts, and etc all work perfectly still, also it is the stock gauges not aftermarket. When I unplug the gauge then replug it back in the RPMs will go up to six thousand and drop back down to zero, but then it will not work once the truck is running. Any tips or help would be greatly appreciated.

[8.1HD/ALLISON]

Shouldn't make the sweep on startup if it was stepper motor?

 

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[kstruckcountry]

I don't know, but the motor is easy to check.

[LowandUseless]

Thanks fella's! I'll check the motor, then I'll move to the wiring diagram!

[Duelin]

If you have a scan tool you can read the RPMs with it. If you have RPMs with the scan tool then it is between the ecm and gage. It would more than likely be the gage.

[8.1HD/ALLISON]

Could be a wiring issue between ecm and cluster? I would get a wiring diagram and start checking that circuit.

 

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[kstruckcountry]

My guess would be the stepper motor inside the cluster for that gauge. Very common.