Scored a AFR meter and mounted it up, its only the single sensor unit but I put the widband sensor into the front eahaust and went for a spin and my AFR looked pretty dam good all withing 12.8 and 14.3, I will do some more VTuning and get the % change minimal and have a little play manually and see how it goes, as you can see in the pic the idle is spot on to what I have set as a Desired AFR

 

They are a nice unit.
I have an ignition pickup for mine as well.
There are a heap of aux inputs, so in theory you can tap into the TPS and MAP etc'.