Thanks, Mark for the tip about grounding the connector wire.

I tried that with no change, then ran a ground to the T7a connector and got
the dash gauge to work as you described.

The problem turned out to be a bad connection on the spade connector
itself.  Have now soldered on a new connector and the gauge works like new.

Thanks to all who responded.

By the way, to those who mentioned that the Temp II sensor is blue, it
isn't. On a Syncro the Temp II sensor is gray, and is the screw-in type. On
a 2wd Vanagon, the Temp II sensor is blue and is the push-in clip type.

Michael J