Dan,

Before throwing parts at problems, I usually check to see what other things the suspected part may control.
If those items work, I move onto other diagnosis.
One great practice is to check and clean all your ground straps and body connection points.
I've chased many problems and replaced many parts without fixing the issue, and have learned over time to try to isolate things.

With my 84 Westy, which I've owned since 87, I've had to run new wires from back to front on a number of occasions.
Keep in mind, sensors are very sensitive and any drop in current can result in weak or bad signals.
A simple nick in a wire, can allow water to penetrate, leading to corrosion and resistance.

You can use an ohm meter to check the wire's resistance.  That's where I would start.

Jack

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Dan N
Sent: Sunday, August 12, 2018 11:18 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: temp gauge not working right...

hi all,

I suspect that the voltage regulator is defective, but not sure because the
gas gauge is working good but I am willing to give it a try...

so does anyone know where to get one? please... searching the net but found
none

this is the one I am talking about, sitting on the blue foil...

http://www.datasheetcafe.com/tca700y-datasheet-voltage-regulator/

thanks in advance