<VV> Termister

[Padgett]

>New as in NOS new or a re-design?  NOS ones have been going for over 200 
>bucks!
>
> >Lew Richel <lewrish at tns.net> will sell a new thermister and match
> >your gauge to it for less than that.

My understanding is that it is a new thermister just not a GM thermister . 
A Thermister is just a device that changes resistance based on its 
temperature and are quite common in industry. It is different from a 
thermocouple which actually produces a small voltage (MV) as a function of 
the temperature difference between two reference points.

Thermocouples are cheap but I suspect that GM went the thermister route 
because they could use the same gauge circuit as in all their other 
electrical gauges (temp, oil, fuel, etc.).

I bought a dual Cylinder Head Temperature gauge from Westach that came with 
two thermocouples and which I plan to put one on the plug for cyl 2 and the 
other for cyl 5 (which are supposed to run hotter than the others) . Was 
thinking about using the factory mounts on each head untill Smitty 
mentioned the effect of the temp under the head on insulation ( 
thermocouple cables are 4 feet long and appear to be armored - would expect 
them to be good for the range of the instrument though - 700 degrees F. 
Would like to hear from people who have mounted in either place.

Plan now is to install in center pod in Monza dash, am trying to train 
myself to ignore oil pressure anyway (too many Jags with "40 psi at 3000 
rpm" in my yout).

Padgett