Angier,

I think that you'd need 2 push buttons, one for each pressure switch.
Wiring both pressure switches to one push button would be trying to run
the pump in both directions at once. Bill Harrelson
N5ZQ 320 1,750 hrs
N6ZQ  IV under construction










So, would not the simple solution be to wire both sides of each  pressure switch to a momentary push button switch?
I have gages installed and so can observe the hi/lo pressures. A push  of the momentary switch should start the pump.

Angier Ames
N4ZQ
...moving ever closer to first flight...