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I dug out a tach and I see the problem - the metal ring is (brazed?) to the back of the metal, not a PCB. In this case, you will have to work a little harder to fix this - either rough-sand a patch of the metal and solder a jumper wire to the metal (not easy without some flux and a big-a** soldering iron) and then to the clock ground or jumper the clock pin to a true ground on the cluster itself - perhaps a wire would be easier.
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