Fuse box Q

You want to choose one that has enough current capacity to power your additional load (or use a relay if overloading is a concern). You also need to use a fuse that is switched appropriately (hot only with the key turned on, hot at all times, etc).

Good luck.

gcwh02 said:

Thanks, do you know what fuse would be hot only when the key is turned on? Or should I just keep trying diff. ones? Its a fuse attached to an inline fuse, and then ran to my tach.

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Here's the fusebox for a fox.

I didn't follow the stuff about the fuses, but this is for a tach? I ask only regarding amperage draw concerns (A tach draws about nothing so overloading a circuit isnt a big worry).

You can simply use your test light to find a circuit/fuse in the fusebox to tap into. Obviously look for something that is only hot when the key is on (e.g., fuse 5, 11, and so on).

Depending upon where your tach will be installed, it can be easier to just grab an accessory (hot with the key turned on) wire in a circuit close to where you're mounting your tach.

Good luck.