Bought a small digital voltmeter from ebay, which I'm mounting above the fuse panel in one of the switch blanks.

I have a fuse tap (add-a-circuit littlefuse type) which I will be plugging into the fuse panel somewhere, providing a connection for +power, and measure lines on the volmeter.

I'm wondering where the easiest place to attach ground wire in the fuse panel area...there's a few screws holding the fuse panel in place, maybe those are good enough?

Originally I was going to wire everything straight to the battery, but I'd rather not go to all that trouble just for a small current draw device.

 

There's a good spot just behind the kick panel right next to and below the fuse panel.

 

Perfect, thanks for the good description, found it easily.

Here's the finished install if you are curious:




should come in handy in the winter, when my truck sometimes sits for a few days in cold temperatures.