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Nice, yes that looks like a dew sensor.
I believe the dew sensor interacts with the machine by simply being a device in between ground and some other point on the machine that takes dew detection as input. Under normal conditions, the dew detection input is grounded and the machine runs normally. When there is dew, whatever physically constitutes the dew detector breaks this ground connection and "opens" the circuit, so the dew detection input is no longer grounded (0 volts).
Had a look at the 1970 manual (which is available on these forums) just to check in case I was way off base, and I think my understanding of it is correct. It looks like one lead of the dew detector is set to ground (0V) while the other lead goes to pin 1 on a chip identified as IC6002. Having a look at what voltages need to be on the pins for the thing to work, it shows pin 1 always being zero volts (attached image of IC6002 voltages from 1970 manual).
So I think you should be fine if you just short the two solder points on the dew detector. Short it anyway you like, but I usually just solder them together. That is what I have done in the past on my 1980's and it's always worked (which incidentally I never knew if that was the right thing to do, because my 1980 manual hardly contains any information about the dew detector! The 1970 manual seems to be more detailed!). Obviously, this completely removes the dew detection function of the machine, so if you are using it in inappropriate conditions it won't stop you!
Last edited by sevarre; 02-01-2020 at 06:52 PM.
Reason: Add IC6002 image
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