Rusty, I attempted to use the stock coolant sensor on the rear housing of my 86 NA.  I found that the curve was quite non-linear.  Would appear to need a gauge with a similar non-linear response or scale.  Attached is the curve I finally plotted (stuck it in a pot of water and calibrated the curve). 

 

Ed Anderson

 

Dandy info Ed!  Thanks.  I guess the big question now is whether Tracy’s EM-2 will work with it. 

 

Rusty