Thanks to all who came to my aid.

Joel said

> snip<<ok, now. one of the senders sticks off to the left side ...
> that's the BLUE
> one for the brain/ECU/computer. the other one sticks out toward the
> front
> of the bus and is SILVER in color (actually, only the base of the
> gizmo is
> silver, but ...) and is the one that drives the gauge.>>snip

Found it.

> snip<<but you WILL get coolant in your
> face, hair, eyes if you loosen it from under there.>>snip

Didn't have to loosen anything.

> snip<<what do you need?>>snip

Didn't need to get anything.

> snip<<clean off the electrical connector and clip it back on.>>snip

As Joel said, I just cleaned the connector and all was fine again.

Thanks again to everyone.
Larry