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.