either of them worth it

and


what would you guys wire the air/fuel to...sensor or ecu???

 

the egt (pyrometer gauge) is worth it, especially if you go f/i.

as for the a/f gauge, your running a narrowband (where the little led bounces around. those are ointles and dont give an accurate readout. if you must though, tap it to your o2 sensor. if you have an 06, the o2 sensors are already stock wideband.

just save up your $$ and get a wideband. itll give you an accurate reading ad is actually worth the money.