I haven't looked at the switches yet, but did your try swapping
pressure gauges? Also what is the measured output on the compressor regulator - Ours certainly was tripping at 120 and the
secondary was at sixty. Find it hard to believe both swtiches were so far off. I am not sure if the switches are adjustable.

I also noted (much to my chagrin) that there were many leaks the first time I put the system together. Especially at the pressure tanks. Getting the teflon tape right takes a little practice.
Use a spray bottle of soapy watter to test your connections.