Dual Fill Model 1. This is the most accurate way to fill your front
tires to the same pressure. BRP tire pressure specs for the front tires
is ± 0.25 psig and most gauges are ± 2.0 psig. This model works with any
air pressure source and any tire gauge. Fill and check pressure from
the center schrader valve (same as the valve on your tires). Because
both tires are filled at the same time the pressure is equal. Unequal
pressure in the front tires will cause pulling toward the tire with less
pressure.
Now have the best of both worlds with the DF-1 and add a CruzTools Digital Gauge and you can get accurate filling with the dual fill and use any air source.
Instructions for using the DF-1 are here.