Using the pumping pressure for diagnosis is fine.
Saying - its got 220psi, so is perfect for Avgas is bullshit.
I have seen a variation of 30 psi in 200 depending upon how wet the bore is.
Try varying the com up or down by 15%,thats instant blowup Vs a piece of shit.
Then factor in the issue of varying pressure depending upon the length/dia of hose between different gauges - a flawed test device of the first order.
Ive got a thing thats unique and new.To prove it I'll have the last laugh on you.Cause instead of one head I got two.And you know two heads are better than one.
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