So far I've got an analog Boost Gauge installed on the driver side pillar in my 94 FD. Looking at the options I've got for a center mount unit- the best I can do is a double gauge cluster that takes the place of the middle stereo speaker. I'm thinking Wideband O2 and Oil/Coolant Temperature gauges, are there any good multi-purpose gauges? Also since I'm very **** about the type of gauge I'm trying to keep them white "AutoMeter" if possible

 

the exhaust gauge is helpful too.

 

If your stock or close to stock on the stock ECU, all you really need is the boost gauge and temperature gauge (stock temp gauge is worthless). Temps can be oil or coolant, but IMO coolant is the easiest to install and monitor with a sensor in 'T' fitting and placed the throttle-body coolant line.
Both should be available from Autometer in white if that's what you're looking for.

 

I too believe that the boost and temp gauge is critical...someone once told me the water one is important too but i am not sure.

 

exhaust gauge!