The Voltmeter, as well as the other gauges and idiot lights work off of the ENGINE fuse.

Does it go to zero volts when the key is off, and ~12V when the key is ON but engine is off ?

If the answer is yes, you're OK, the gauge isn't too accurate.

- seen in FOUR WHEELER mag July 2006 & OFF-ROAD mag Feb 2007 -
'84 4Runner ARBed 5.29s F&R,4.7 & 2.28 t-cases,hy-steer,BudBuilt skid,30spl Longs,36" TSLs,Chevys

'83 P/U, Buick 231 V6,Holley 4 bbl,Weiand intake,Downey headers,TH350 w/700R4 gearset