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tachometer calibration

wounded minnow


I have a 1988 90 H.P. Johnson Outboard which I recently installed a tach. I am getting some weird readings. The needle will show 5300 RPMs and hold for a while and then keep rising. I have been told there is a calibration adjustment on the tach. itself, but I'm not sure where. I don't have the original instructions any more. Any help would be greatly appreciated!


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