ETL2GO,
I'll assume your enquiry is genuine so at the risk of repeating what some have already said, here's my 2 cents worth. The manifold pressure guage gives you an indication of the torque being produced by the engine -
Yes, you can ignore the guage & pull power in any model R22 until the RRPM droops.
Yes, you will get away with it for a while.
Yes, the drive belts will shred & depart the scene eventually.