>
> and bingo.. hallelujah... the needle of the coolant temp gauge raise to a
> bit over the light.... it's working now.... I have to see why it over the
> red light but I am happy and try t fugure how I would add extra ground on
> the sender body
>

Voltmeter will tell you whether the open ground is between sender and
thermostat housing or between housing and engine.  Remove and reinsert
either the sender or the housing bolt(s) depending, making sure they are
seeing clean metal.

Or you could use a hose clamp to clamp a wire to the sender body.  I would
not recommend soldering to the body as it might damage the seal or other
innards.  If you do solder, the elegant way would be to file down one of
the flats so you can solder on a piece of brass in the form of a male spade
terminal.

Yrs,
d