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My old Silca pumps gage is down on the base where I can't read it, so I just put an index mark on it with a sharpie. I pump the rear tire to the high side of the mark and the front tire to the low side of the pump and all's good. The lens is loose so I can just set the index mark at the desired range, depending on tire/wheel set.

I've got a Bicycle Gauges Archives - Accu-Gage by G.H. Meiser (ghmeiser.com) for when I want to get fussy. In fact, a stand alone air gage is probably a good thing to have if using more than one pump to inflate tires. Compare the pressure readings of the pumps to that of the gage and find the point spread for the pressure you want. 1 pump may read 50, the other 75 and the gage 60 for the same pressure. No sense pumping to the same reading on both pumps when they're wildly different pressures.
 
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