Just wondering which gauges you have displayed on your units also if you have a boost gauge do you have it displaying boost psi or bar Rich
It's up to you. Psi allows you a finer figure on a proper boost gauge. Anyway, the scan gauge boost gauge can't always be reliable as it's electronic and will be slightly delayed compared to an analogue one.
The reaction time is slightly slower with the electronic boost gauge(fraction of a second) but unless you have both side by side I doubt you would notice plus most people only care about max boost where there is no difference if both are calibrated right.