Severe voltmeter needle oscillations

Hi guys

I replaced my ammeter with a chinese voltmeter (plugged onto the fusebox).
When the engine isn't running, but the ignition switch "on", all is normal and the needle is immobile on 13 volts
I start the engine, the needle still reads 13V+, it's ok.

But after a very short time, the needle begins to oscillate rapidly between 8 and 16 volts.
When I engage the reverse gear (which turns the reverse lamps on) or put the turn signal on, the needle falls completely to "0", indicating (I...

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Author: admin