Quote:
Originally Posted by deuce lover
I did and here is a close up pic of a 36 gauge.
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That's the head unit that mounts behind the gauge face. Looks a bit different than the '37-'39, but should still be adjustable as mounted on the gauge face. Look for a scribe mark on the glass tube, visible only from behind, to line up with the 212º mark on the gauge face. Also, as Marko39 says, the sending unit in boiling water should line up with the calibration mark.
EDIT: OK, I'll concede that the early units not only look different, but apparently are not able to calibrate as on the '37-'39, that feature perhaps an improvement for '37. There is one more issue involved here, that being that sending units are also specific to model, the depth being different than in other applications, which could affect the reading.