On my oil filter setup, there is a restriction inside, in the center pipe of about 1/16" or smaller. Somewhere in your setup, you need that restriction. The gauge will work off either feed.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!