I hooked my original 1946 gauge to the top center of the head on my 1962 235, there was a 1/8" pipe thread there. It works perfectly. Holds right in the center at 15 PSI once it warms up. Then I used a after market gauge that is feed from the block and mounted under the dash that reads 40 PSI.
Last edited by Chris's 46 / 515; 01/13/2023 1:58 PM.
