Join Date: Mar 2002
Location: Austin, TX, USA
Re: Funky Autometer issue......
Grounds can fool with your readings for sure. But usually a bad ground will cause you to read less voltage - not more.
Measure the voltage at the back of the meter to see if it jives with what you measure at the battery (14.3-ish as you said). It seems like autometer gauges have a potentiometer inside the back of the housing where the bulb inserts. Remove the bulb and peek inside. If you see a tiny screw adjustment, observe where it current sits and give it a tweak with a small (perhaps jewler's) screwdrive to see if you can dial in the gauge reading to match the voltage accross it's terminals.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI