I'm with FG...my gauge is my hand...and DG if you make that trip often I'll bet you are able to estimate low altitude inflation so when you get there you are close to optimal inflation.

I guess all our situations are different but I must say I can't remember the last time I had to top off....I inflate with a shop air compressor and head out....there is a certain leeway and it's not rocket science....[note I didn't say "rocket surgery"].

I like how this Rule pump has been touted...[DG your experience is like mine ...the cheep ones don't do the job]....a good back up is a good idea....so Joni how did you get it for 1/3 Norm did?????