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I have one of these on my 83, cost me about $15.

It's small, fits flush and works great. I also put a switch below it so it wouldn't stay on all the time as it's run straight to the battery for a true reading. It was linked to the ACC socket at first but was showing 1.5v lower than battery voltage.
Sorry I can't remember where I got it, but found that one here...
http://www.treestumpmse.bc.ca/page17.html
I have one of these on my 83, cost me about $15.

It's small, fits flush and works great. I also put a switch below it so it wouldn't stay on all the time as it's run straight to the battery for a true reading. It was linked to the ACC socket at first but was showing 1.5v lower than battery voltage.
Sorry I can't remember where I got it, but found that one here...
http://www.treestumpmse.bc.ca/page17.html