I live at about 900m above sea level and have my Dawes valve set to about 16 psi. I notice when I go down to the coast that reading will increase to as much as 18 to 19 psi. Now I know that atmospheric pressure is greater at the coast causing the increase and I have to stop and wind back the Dawes about half a turn which gets it back to acceptable levels. I have experienced an over boost engine code on the odd occasion I don't do this. Car performs well at home at my original setting. I also noticed that egts are down a lot further at the coast.

I guess what I am asking is there an easier way to do this or do I have to re tune every trip to lower altitudes.