ProSport Analog AFR Gauge 60mm

Affordable, accurate AFR gauge kit

One of the key things to monitor when modifying any car is the Air Fuel Ratio (AFR). Too rich(to much fuel & lower number) and you will lose power have excessive buildup in the cylinder and shorten the life of the catalyst system amongst other things. Too lean (not enough fuel & higher number) and you will run into detonation issues (bad for engine). Most modern turbo or supercharged vehicles like to be about 14.7 AFR when idling or cruising and between 11.0 - 12.8 AFR at peak torque. The factory will usually have these cars run richer (like 10.0-10.9 AFR at peak torque) so tuners will lean it out in that area as one of the first steps to tuning. Newer direct injection engines (like the R56) will like to be leaner at peak torque because the high pressure injection has a cooling effect and has better atomization, both are more resistant to detonation.
Wideband Air Fuel Ratio Gauge
52mm (2 1/16")
0-5 volt
Utilizing the latest Bosch wideband O2 sensor -5 wire heated LSU 4.9 (Prosport Inc. is the only one in the USA to use them) our gauge now has the widest range 10.0:1 to 20.0:1 AFR readings on the planet.

This is a complete kit that includes everything you need:
AFR analog Gauge
Bosch 4.9 5 wire heated O2 sensor
Weld in Bung
Instructions
Wiring harness(Gauge to O2 sensor) Plug and play
Decals
Visor/hood