This time around is a bit of vintage tech: a thermocouple vacuum gauge. The part seen above, and represented in the schematic, is the sensor side of things. ... (20-30 years, in my case).

Vacuum Gauge Display; ... May 14, 2015 at 9:30 pm Wow, ... where all the electronics is contained within the gauge head itself, and simply output a 0-10V reading.

IT is known that the range of a hot-wire vacuum gauge may be extended to 10 mm. mercury pressure or above, if by some means the current supplied to the wire is increased with increasing pressure1,2.