Get a Dragy. The are easy to use, can use it from vehicle to vehicle, and amazingly accurate. Just find an isolated stretch and you're good to go:
https://dragymotorsports.com/product...erformance-box
Don't rely on O2 sensors alone, there's a lot of ways it can fool you, and can get into trouble real quick.
EDIT: Looks like the current version is Dragy Pro, and previous units are sold out:
https://dragymotorsports.com/products/dragy-pro
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
http://forums.maxperformanceinc.com/...d.php?t=760624
1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
https://forums.maxperformanceinc.com...ght=procharger
Theme Song:
http://www.youtube.com/watch?v=7zKAS...ature=youtu.be