I would use a gauge with 300 lbs. capacity. Adapt the line to fit the case.
In your situation notonly are you looking for pressure in each gear but how it responds when you lose gears. If it ran for a while after the rebuild you likely have a cut seal or a broken metal seal. Check pressures in each gear and report your findings if you need help deciphering them.

What year trans is this.

Last edited by Transman; 11/09/17 04:24 PM.