I currently have vac/boost and oil temp. I dont have the AFR gauge hooked up, MSPNP is handling it though. I have a knock sensor + led to prevent major trouble.

May hook the AFR gauge up later but find it to spike/jitter alot to give meaningful reading when only glancing. Good for MSPNP and logging though.

YMMV..

 

This is how I have mine setup, maybe overkill to some, but I enjoy knowing what's going on in the car:
Pillar - Boost on bottom and fuel pressure on top
Left eyeball vent - WBo2
Under radio - Oil temp, oil pressure, and EGT
Water temp and IAT are displayed by the Link onto my Palm Pilot.

 

I want your interior.

 

Boost and EGT in ricer pod. One day I'll install my hydramist and that gauge will go in left eyeball vent. EGT is very useful for WI tuning. I don't know you can get this gauge but AIT would be neato. Temperatures here vary a lot and it really feels like I lose 30 HP from a 70 degree to a 90 degree day. Sometimes I wonder if I just had too much caffiene when my car feels slow like a bus. Maybe I will run AFR if I build my bottom end.

 

Knock gauge
Oil Temp