Posted for Lorn H Olsen <lorn@dynacomm.ws>:

 Matt,
 
 The high side should read between 800 an 1,100 psi. The low side  should be
between 400 and 700 psi. Overshoots of up to 200 psi are  normal and just
fine. The pump itself has a 1,500 psi relief valve.