Tach not working correctly after removing gauges

[Asahi123]

I removed my gauges and cleaned them resembled the gauges. I checked to make sure it is getting 12v. The tach worked before I took it apart. I works now but not accurately before it shows 200rpm but before when it worked it was reading 600rpm. So could the gauge have just crapped out and not reading correctly? I have checked all connection. Any input would be greatly appricated
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