Agree with others. Hold course. I don't think it is time to rebuild yet.
The flickering gauge may be due to loose wiring not the gauge itself. Warm the engine up then shut the engine down then turn the key to the on position. Shake the wiring while a crew member watches the gauge. Careful leaving the key on to long when the engine isn't running. If the EI is closed you can fry the coil.
TRUE GRIT
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