The long and winding thread recently on overheating(which I haven't
totally solved yet) has gotten me to thinking.

1. Since I don't have the VW ECU working, does anyone have a
semi-bullet proof method of adapting a regular VDO water temp sender
in that hole in the T-stat housing and keeping it from leaking?  I
realize I'll have to run a separate ground wire from the body of the
sender, but other than that bridge to cross, I stand ready and
waiting to sample some of your ideas.
2.This all leads up to the master plan.  That is to take my existing
water temp VDO cockpit gauge and set up 4(or however many) separate
senders throughout the cooling system and have a multi position
switch  that would allow me to read the coolant temp, WHILE DRIVING,
at the various points along the way and use that info for the diagnosis.

First off, how may would be needed and where would you place
them?  I,m thinking one before and after thermostat and one sender
for the inlet and one sender for the outlet hose up by the
radiator.   Wiring would be the least of my worries, and besides,if I
get problem number one solved, we might get a decent accounting of
where the factory needle gauge is reading.

Please fire away with your thoughts.  My sender for the water temp is
currently Teed into the small hose that gets bigger back by the #4
cylinder water outlet(sorry; 2.1 liter 90 GL here)

Thanks

DM&FS