i use a type k for the egt's as its good for about 1250 degrees, this is connected to a pectel t6

i used once of these for listening to det
http://www.tooled-up.com/Product.asp...FVJ3fAodgD0AOg

to measure air fuel ratio, i use a ntk wideband connected to the t6 again, and a bosch wideband connected to a innovations motorsport lm1. this is also connected to a datalogger, measuring against boost pressure (can do a few more analogue inputs aswell tps/inlet temps bla bla)