Any pressure gauge..and an old R12 hoses works b/c it has the schrader valve release pin.

You do not have to go to he rail ..it just makes it so much easier than to go checking the pumps with each test.
And a bad connection will show immediately
These are jsy my procedures ans I go the most effective route.
My suspect is OVP or fuse 6..but I have to check these first b/c yor guy diagnosed pumps, so I have to secound opinion him. He may be correct.

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A Dalton