Good to know!
I had a scare with my temp gage...which is really an identical gage internally to the oil pressure gage. I let the new engine get too hot, so it boiled over...the gage went from full scale hot to pegged on the lower stop. Randall warned us about overheating the gage!
I was bummed thinking I would have to pull all that capillary back out to fix the gage and then re-install it again. I had a thought, and was able to pull the gage out of the dash enough to take it all apart. I found the gage got so hot the little wire popped off the needle arm. That was easy to fix, but now I had to re-calibrate it. I boiled water in the kitchen, and ran the pot quickly out to the car to dip the temp sending bulb into it. I would set the gage to 212 degrees, and then remove the bulb from the pot, cool it off and set the 90 degree stop. After about 3 times running from kitchen to car I got it recalibrated. Put it all back together, never having to unthread the capillary.
Lesson learned...never over temp or over pressure these mechanical gages!!