Both gauges are pretty accurate at telling the realtime boost level. Many of the electrical gauges have the ability to indicate the driver if a specified boost level is reached (warning). Another feature is peak recall where the driver can see what the last highest boost level was at any time. Some electrical gauges also have a playback mode. They will record the last x seconds of readings and allow the driver to play it back.
When the going gets tough, the tough go: "Screw it... I'll let bernie handle this. ADMIN DELETE" - zboost 15:45:05 01/31/04