temp light blinking

[gatesj at twcny.rr.com (John K. Gates)]

> My Jetta has a 16V from a rocco. They PO did a really
> good job w/the conversion, to the point of being a
> little fanatical. He is a wiring guy, when you put on
> the rear window defog, a little set of Xmas lights
> come on too. Up by the driver's sunvisor there is a
> power supply for a radar detector.
> 
> Yesterday during my quest for parking, the temp light
> was blinking upon starting the engine. The motor was
> cold of course and never even warmed up (I got very
> lucky w/a spot).
> 
> Any ideas whats that about ?
> The speedo is jiggy too, esp when you go over 100mph.

We just saw that on an A2 Jetta up at the shop after a stealer had 
replaced the motor with a factory rebuilt (guy spent way too much 
money).  They had plugged the line for the temperature sender into the 
wrong place.  Just run the lines down, the wires should go to a sensor 
to a coolant manifold coming out of the head?  Perhaps the sensor is bad?