We use a MEL for the C172SP I rent to train in. Part 141 School.

Not likely, Jay. People often refer to the equipment list of a C172
as a "Minimum Equipment List", but that's not what it is.

As the other poster said, no MMEL exists for a C172; the only
single-engine MMELs are for a Pilatus or a Caravan. There is a
generic single-engine MMEL that could conceivably be applied to a
C172, but normally such an aircraft doesn't have enough redundant
equipment to make such an effort worthwhile.