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You may be right on the money! There is a non Johnson tach on the dash. I thought it could be a tach driver earlier but I was thinking a Hall effect pick up which wasn’t around in 1959 which is when I think the tach was put in. That means sort of aftermarket original equip. When I thought the Hall effect pick up wasn’t possible I threw that idea of a tach sensor out. I’ll bet you are right. The boat is upside down just now and it’s quite difficult to get under to trace the wiring. But I’ll bet that’s where it goes! Nice job. Just a simple coil shooting pulses to the tach? Even the right shape isn’t it. Thanks! I owe you a beer. Regards Tom