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You're good to go. The (leak-down) test we call compression test is generally looking for a leaking valve seat or excessive piston ring leakage. After a short run and depending on how much time the cylinders have to cool down changes the leakage also.

I installed a SIM magneto on a plane with the digital tach from Electronics International. The stand-alone tach model R-1 would not function with the electronic mag. Rather than buy an expensive signal adapter I decided to renew the electronics geek living dormant inside me. End of story: a...