OK... first and foremost *THANKS* to you all.... David, Jim, Stuart,
Dennis, Jim and others.... too many to list....

*my temp gauge not working right problem is* *SOLVED ! ! !*

as recap the thermostat housing on a syncro is aluminum (not plastic) and
the sender has only one wire for data, the ground is on the body of the
thermostat and the sender.

today I check the voltage stabilizer -> it's good, I check voltage/ohm on
the instrument cluster wide connector at pin and ground -> it's good - but
then the gauge still not working.. aaargh -
I cleaned the contact surface of the sender and the thermostat housing with
a wire brush on a Dremel but still no deal...

my son came over and says *"Dad... just give it up and put on a VDO temp
gauge and call it done..."*

*" yeah Nick I'm thinking about it but me let try this one last time..."*

so using a wire a with an alligator clip on both ends - one end to the body
of the sender the other end to the chassis...

and bingo.. hallelujah... the needle of the coolant temp gauge raise to a
bit over the light.... it's working now.... pheew...

I have to see why it's a tad over the red light but I am happy and try to
figure how I would add an extra ground on the sender body - problem solved
but finishing job is not done ...

one more time.... *THANKS* to you all.

dan