Jib, oil temp and boost are best IMO.
Boost for monitoring health of the turbo. (overboosting and not enough boost and you'll know straight away that you have a
problem)
Some peope say oil pressure instead of oil temp but i dont see the reason why. If theres a
problem with oil pressure the oil pressure light will come on on the dash so whats the point? Its a very boring gauge aswell, it will hardly ever move.
Oil temp lets you know when to put the foot down and when not too. Let it get upto 85-95c before giving it the beans, anything above 120c and then back off!
No gauge, no way of knowing this!
I dont care what anyone says chipped LCR's have a
problem with running extremely high oil temps, you need to know when to back off! A sustained 100+mph run will easily see the temp reach beyond 120c. A top speed run for just a few minutes and you'll be at the top end of the temp gauge!
Not good, and without a temp gauge you would never know!
I would say a temp gauge is a must for a chipped LCR!