[nespharym]

Besides boost gauge, what is next one to have

[continentalg5]

Oil pressure.

[RiXst3r]

This might help:
http://www.e90post.com/forums/showth...ghlight=gauges

Everyone voted, you can see the results.

Loost like Wideband AFR is your winner after boost.

Boost/vac 131 91.61%
Oil pressure 20 13.99%
Oil temp 18 12.59%
Water temp 18 12.59%
Air/Fuel ratio (wideband AFR) 54 37.76%
Fuel pressure 7 4.90%
Volts 5 3.50%
EGT (exhaust gas temp) 23 16.08%
Compass (heading) 5 3.50%
AIT (air intake temp) 22 15.38%

[JB335]

how does BMW feel about boost guages? Leave them installed for service??

[RiXst3r]

Originally Posted by JB335

how does BMW feel about boost guages? Leave them installed for service??

depends on the dealer, but I make my kits easily removable just in case people don't want to worry about it.

[BoostedBMW]

I probably voted the same in that thread that rixst3r linked... I think a wideband AF gauge is probably the most useful gauge on a tuned car after a boost gauge. I had one on my last car, which was useful when we had it on the dyno, but once the car was tuned it never had much use unless I got the urge to play with the boost controller.

[camaross305]

I would say wideband then fuel pressure......A wideband will tell you pretty much everything as far as your lean/rich conditions. If you have low fuel pressure, bad injector or something just causing a lean condition. I think its a really important gauge.

[gimp2x]

you don't need gauges, your car is pretty set, you're not adding additional fuel systems, ignition systems, etc

check your boost, that's about it