How to make a pressure gauge with a cut off valve for an air filled seat cushion? Gauge suppliers?
It's a matter of comfort/stability/safety, where under/over inflation can impact the safety. currently it is done by "how does it feel" and physically feeling the firmness. Both of them are subjective and can be wrong. This is the reason for the gauge which would only vary in conjunction with the weight of the person sitting on it and air temp(altitude on rare instances).