Join Date: Sep 2006
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An engine hour meter is so rarely viewed, that it does not have to be on the instrument panel. I have one on an engine room bulkhead. An hour meter needs only to take its nominal 12 V positive supply off the ignition switch. All it needs then is an earth return to anywhere on the negative bus. Run the negative right to the battery negative terminal if you want.
Just splice a connection onto the positive side of the ignition switch, and route it to the hour meter, then an earth to the battery negative.