Join Date: Mar 2002
Location: Austin, TX, USA
Re: Volt Meter Reading
Voltage problems could cause the tach to malfunction, though I've never seen this myself. Silicon diodes, for example, will break down once they heat up to a certain point. I'd follow Jim's advice and give the regulator circuit some attention. You should have no more than 14.5 volts.
On a separete note, lead acid batteries (not glass matt or gel types) should not exceed 16 volts under charge. If they do, it's an indication that the battery is "sulfated".
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI