Is your guage for a wide band or a narrow band mate??

Wide bands need seperate controllers and you must use the right sensor.

Narrowbands can use almost anymake of sensor as long as its the correct type

Check out www.turbobits.co.uk
and www.tuneparts.com (bottom left of home page click on "Just Lambda"

A 4 wire sensor has a built in heater and is slightly more accurate.

Matt.

P.S. bast ask the guage manufacturer what sensor they recommend