If you're asking which 3 gauges you should buy for the pillar, I would first have to ask if you have a scanmaster. If you do, many parameters are displayed on it including water temp, so you don't need that one. A tach? Usually one just floors it and the car shifts itself. Oil pressure? Not on the pillar, and there is usually little or no pressure anyway. A knock gauge maybe, I prefer an audible knock detector because that's one less thing to have to watch. I vote 1) boost 2) an isolated fuel pressure gauge under the boost gauge (they should rise at the same rate) and 3) A/F meter so you can see rich or lean at a glance. Other gauges already mentioned can go on the console or under the dash. It's just my opinion, others will probably differ.