IF I was going to put gauges it would be oil temp, oil pressure and boost (only because the ECUdatascan has a 18.5 PSI max reading).

If I had to squeeze in a 4th one it would be fuel pressure.

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[COLOR=Black]Liberty GT Spec B tuned 240 HP & 372 Nm at the hubs.[/COLOR] "Instead of banning high performance cars - ban low performance drivers"

I run 3 x deif's in a gauge pod.
Boost, oil pressure, and water.
I went water temp simply because the standard gauge in the dash sits in exactly the same position from 70 degrees right through to 110 degrees... hardly useful in my opinion.

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Signarape!

6" tacho with massive super bright shift light smack in the middle!

I would try to go boost, oil temp and water pressure. Not sure how to do the last one but to me thats more important than oil pressure etc. I mean if you have no water pressure your water temp will stay the same as there is nothing to read off. Also if you're at the track and pop a hose you know straight away! No lunching of the motor hopefully.

I've got Oil Pressure, Oil Temp, and EGT in the center pod and Boost Gauge on the A pillar in a single pod. Next is the volt gauge when i find a spot.