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Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today.
Hour meters are usually connected to the ignition, when the ignition is on the hour meters will accrue time.
On the tach, this depends on if it was ever changed such as alternator sender driven, if running the factory mechanical drive it will be on the location you indicated off the cam. Try swapping between the two engines after removing the tach drive to inspect it.
Thank you!- Joe
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No, not on the alternator.... what I meant by that is for instance if they had been changed. The factory units are driven off the cam or glendinning unit.
You'll see the tach wires going into the mechanical sender on the front of the engine.
My pleasure Bill, have a good afternoon.