When I did my engine, Billmtold me I should have about 145psi. So when i tested it with my canadian tire gauge, I got 135lbs. So I went to an autopart store I bought a 200$ gauge. It was reading something like 137psi...
So I give back the 200$ gauge to the store.
if it would have a big gap, I would keep the 200$ gauge, but since it was 2 psi....
But usually quality goes with higher price.