Did some testing today and found the VDO voltmeter ( half gauge style like the 911 gauge )reads 1.5 low.

Can the needle be adjusted ?

Probably have to go for calibration to one of the shops

I would pull the gauge and test it with short leads to battery to make sure it is not a problem with any of the wiring. Then testcthe vattery with a good multimeter.
Is it reading too high or too low?
If too high you might be able to put a resistor inline to drop the reading.

It reads about 1.5 v low. I,lol try your suggestion

You could easily be dropping 1.5V through the wiring and chassis ground since these are 40 years old and full of corrosion.

Not sure about yours, but the 914 volt meters that came in the factory console do

have a internal adjustable pot to calibrate them. You can access this by removing the

case.

Mike makes a good point. When I built "Kugel" I ran a dedicated line for the voltmeter to rid it of lies. Glad I did that!

That did the trick ! Ran a wire from the gauge to the battery, reads perfect. I wired a relay right behind the gauge so the Voltmeter won't remain on when the ignition is off.
Thank'so for the suggestions...

And now you won't get a 'voltage drop' when the lights, heater fan, and blinkers are on.

Every newbie will ask that question sooner or later. I did. Or the question re: one side of the car's parking lites staying on??? I feel like saying, "Here's your (newbie) Sign!

X@



just make a mental note of the difference and live with it

.

Did you include a fuse in line with the battery? If not the wire will become the fuse.

Will do ! Thanks.

i like those quirks

The new ones have an adjustment screw on the side at the threads for the attachment ring. Glad you fixed yours.