air fuel gauge on turbo project

[Doug30racer]

I was thinking of adding one to my turbo project. Wondering if it should be installed in the pipe (before the turbo), or in the exhaust can (after the turbo). Any brand I should be looking into for 2 stroke perference. What is the ratio with a turbo.

Looking for input

 

[Wheel House Motorsports]

put it after the turbo about 4-6" and good readings are

idle 14.5
crusising 13
wot, 12-12.5 for peak torque and saftey