That's interesting, and apparently much more complicated than the system the -5 uses. The -5 has a resistor which is matched to the engine to reduce the voltage coming out of the ITT harness and show you the actual ITT. It doesn't compensate for altitude or temperature or anything else.
The SRL on the -10s (the factory ones) is a whole different beast, which does all sorts of compensating-- but it's much more than a simple resistor.
This -1 system (or are yours -43s?) sounds more like the SRL, only done without the benefit of digital technology.
Adam, you should still be able to trend monitor, regardless. While the absolute number you record might not be a "true" reading, it should be the same for the same conditions and power setting.
@dcronin37, I guess my concern with using uncompensated values is that you might end up over-temping your engine during start or ground operations-- do you go much above idle?
If you don't have the compensating resistor, how will you know what the temperature limits are during start?
