I run a MSD DashHawk (pre-Insight) in addition to my EGT, Turbo, HPOP, Fuel Psi gauges. The DashHawk monitors the ECT, EOT, Trans Temp, and Voltage on the main screen with alarms set on all of them should they get too hot or low (voltage).
I used to run only the DashHawk w/ an EGT probe and it worked quite well.