Quoted for fucking truth. Nobody uses pillar mounts anymore, total rice, especially in a FC or FD where there are plenty of usable dash locations.
That's just asinine. I have two gauges on my pillar, and 3 more in the "idiot light" area. Water Temp, Oil pressure, fuel level, speedo and tach are not sufficient gauges for a turbo car, especially an automatic.
I have wideband and fuel pressure on the pillar, the wideband is digital and easy to see, and the fuel pressure isn't a "constant check" gauge. The idiot light area has my boost gauge/controller, and oil and transmission temperature.
Please though, keep filling us in with your brilliant absolute statements, after all, your exact circumstances are the same for everyone else.
To the OP: I'd look at replacing the stock water temp and oil pressure gauges in the factory cluster first. If you still want more gauges, well, what's the purpose of the car? Street car? You probably don't need any more gauges, but, if you must, wideband O2 and oil temp would be my recommendations. For an a-pillar mount, I like digital gauges with warning lights, as it's easy to see in your peripheral vision, vs. analog gauges.