Bose has it right in his last post if you want to use your EASA rating to get the MEP put on your FAA 61.75 but there is the alternative route of obtaining a FAA multi rating and adding that to your 61.75 (US TEST PASSED method) if you want to fly MEP in the USA. You will probably have to fly dual anyway as it is unlikely anyone will just rent you an MEP. More likely is the expectation that you will fly exercising the duties of PIC with an instructor present . That has to be logged as dual by EASA standards, but is a fudge by the FAA to allow PIC time without being solo. Getting P1 hours that count for EASA will entail being solo and you may find it a struggle to rent aircraft in that situation