You can buy a pressure gauge/vacuum gauge (it does both) for about $20 at any auto parts store.
Yep - and I am considering that.
~ Rick
1947.1 GMC EC152 [228ci + 4spd] "Love at Last" Follow in the DITY 1968 Firebird [350-4 + th400] 2022 Tacoma I've been more of a car guy - but always wanted to get an old pickup