Put mine on the back of the truck bed, between the bumper and the tailgate, above the license plate. Done when I had the TT, and still OK to use with TC. I use the handheld air suspension pump that I usually carry on the Harley, very accurate gauge built in, & flex hose to the coupling.
You can purchase with 30, 60 or 100 lb gauge. About $50 at J & P Cycles.
Progressive Suspension 0-30 Lb Gauge-Mounted Air Pump
Simple to operate and extremely accurate
• Produces pressure of up to 200 psi by delivering 7 cubic inches of air per stroke
• Ideal for setting the pressure on air forks, air shocks or anti-dive fork components
• Permits minute adjustments by using a ‘let down valve’
• Features an in-line check valve to ensure a no-leak operation and disconnect
• 0-30 pound gauge