Where can I connect my RPM switch so that when the ignition is turned on, I will get power to it, instead of having it run 24/7 through the battery connection. And I do not mean on as in activating the VI, just general power to it.

 

Any ignition switched fuse, cigarette lighter, etc. Mines hooked to the cigarette lighter.

 

Mine is hooked up to my nitrous arm switch.