I have an Autometer 10,000 rpm tach and in the wiring instructions it says that for one of the terminals(3rd one in from the left in the diagram below) that it goes to a 12v Key On source or to the Dash Lighting Circuit. My question is does it matter which one you hook it up to, because one way would give it power when the key is on and the other way would do it when the dash lights are on. Also what is this wire for, as the lights for the gauge are wired separately.
And this is the Tach that I have.
And this is the Tach that I have.
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