I've got some pin info at http://www.tiac.net/users/shansen/belljar/tcgauge.htm
If your tube isn't one of those, I (or someone on the forum) can probably find the info. Other than that, find the pin pair that produces a current (the other pins would go to the mV meter), best done by tracing the wiring. TC circuits are pretty simple as a rule.
"Zero" pressure for a TC is at or below its minimum pressure, usually 1 mTorr or below. You can get about as good as needed at 10 mTorr or so.
Steve
Created on Wednesday, April 18, 2001 8:50 PM EDT by Steve Hansen