Repairing the 70s Porsche VDO Tach

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This is the precise Signal Generator from my company Lab.

Technicians claimed it worth twenty thousand HKD back 10 yrs ago.

I tried 10v to 14v square wave, range 1khz to 10khz. No response. πŸ™

Then tried to put a 3v DC across the pointer rotor motor. ItΒ  turns. πŸ™‚

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