ever since i lost the engine in my 67 mk 3, yrs ago to a similliar problem..
  I keep a constant eye on my temp and oil gauges
  i have tested the running temp of my car, and i know my temp gauge reads 
high,
  but every time it gets up to the hot, i get worried anyway
 anyways...if you can figure out a place to install it, you could use one of 
those 
  idiot light type thermal sensors.  and hook it up - with or without a 
relay, 
  to a buzzer
  Paul   fontana  ca 
  ps--its noisy outside, with all that racing going on down the street..
 
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