[sperry]

Here's my gauge importance order:

Boost, Oil Pressure, Oil Temp, EGT, Water Temp, A/F

Though, I'd bump EGT higher if you're going to be driving the car hard but not at the race track. The oil temp and pressure are more important if the car's seeing a lot of lateral G's, but EGT is a better indicator of an issue with the car running lean.