If the compressor clutch is short-cycling the switch is fine. The refrigerant is just low. Whent he cycling switch fails, it usually causes a no-engagement condition.
With the system OFF, underhood temp at around 60-80F, you should show around 70 psi or so (static pressure). This pressure changes with the ambient, so it will be hight if the under-hood area is hot or lower if it's cold.
Steve
