Review on 🔧 RockShox Shock Pump (convertible for high pressure and high volume) Boxxer by Kyam Deriphonse

Seems to work well with my RockShox fork and Schrader rear shocks provided the pressures are right. However, using it as a tire pump is a bit cumbersome. My tubeless Presta valved MTB tires seem to be getting air but the gauge keeps reading zero, maybe it's not calibrated to read the low 20psi I'm running but it seems fine, for those to read higher shock pressures of 100-160 psi. Could you include instructions on how to switch the handle from low pressure to high pressure, maybe I'm missing something for the gauge?