no offense, but it's cheaper brand new...
http://www.ebay.com/itm/Auto-Meter-4321-Ultra-Lite-Mechanical-Oil-Pressure-Gauge-2-1-16-in-0-100-psi-/130875536902?pt=Motors_Car_Truck_Parts_Accessories&hash=item1e78ca3606&vxp=mtr
you might have better luck if it were $10 less or so