Fuel Gauge Needle Viabrating

[Garf]

I have a 99 Express 1500 4.3L automatic. I recently replaced the generator and ECM. The fuel gauge is working, but the needle is viabrating. I have never seen this before. It does this even with the engine stopped and the ignition switched on. Does the dash have its own voltage regulator?

[Hardwood Goat]

You are prob wondering why 24 people had nothing to say....me too. I have the same problem on my 99 2500 4.3. Pump hasnt went out yet, keep your fingers crossed!

[Garf]

The vendor that supplied the replacement ECM said to fill the tank half full then disconnect the battery for 4 hours. We'll see.