Air/Fuel Ratio Gauge, Anyone using one? Options

[race914]

A little background. I bought my motor used and besides not knowing how well it was tuned to start with, I changed out the 4 into 1 headers with a set of Chris Foley's 4-2-1s.. Sometimes I get pops & flames out the exhaust on decel so I'd like to see if my Webers are jetted right.

I don't have easy access to a chassis dyno and am considering a wideband Air/Fuel Ratio Gauge so I can log and monitor the data at the track.

Again, I'm curious how my normal AFR is with just my Phase 9 (sometimes I'm getting pops & flames out the exhaust on decel) and also what happens to my AFR when I add my supertrapp onto the Phase 9 for <=90db tracks, etc. (This usually eliminates the pops & flames)

I could make a long tow to a chassis dyno somewhere but I'm thinking the gauge might be more helpful longterm to have ongoing access to the data..

Anyone use one of these?

(IMG:http://www.autometer.com/img/products/4378_d.jpg)

AutoMeter

or one of these?

(IMG:http://shop.airfuelratio.com/images/product_1_zm.jpg)

NGK

I know there are lots of other brands out there too (AEM, etc.) Anyone get good enough data for tuning purposes? Or should I just go find a chassis dyno?

Thanks in advance for any feedback on your experiences