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Tell the store the gauge is broken.
Even worst case, it'll still do around 50psi - 80psi on a running engine.
Actually, a cold engine will register higher numbers on compression.
Cold engine will normally register 5psi - 10psi higher.
Not propping the TB will show 10psi - 20psi lower numbers.
Did you pull out *both* trailing spark plugs?
(You're supposed to use the top / trailing holes.)
If you're using the leading holes, numbers will be down 5psi - 10psi.
If you don't remove the other side spark plug, compression can be down 10psi - 25psi.
-Ted
-Ted
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