Air pressure gauge. P/N 7954512, alternate p/n 508A, 10500706, 1508002. NSN 6685005153478. Can be used to replace 12276938, NSN 6685011095695.
Note- this is a mechanical pressure gauge, no electrical power required. Threaded flare fitting for input pressure line.
Can also be used to monitor oil or fuel pressure. Do not exceed 120 PSI input pressure.