FYI Rob,
The AEM only shows 11:1 on the sweep. The gauge actually measures down to 10:1.
I'm using an NGK AFX Powerdex with an NTK sensor. Approaching 45,000kms on this sensor and controller without issues. Matches up to the many dyno's I've been to over the years.
Never tried the unit Peter's suggesting, but I've definetly had a handful of failrues regarding widebands. Whichever you choose - make sure it either comes with, or is compatible with, an NTK style sensor. Had about 3 bosch sensors burn up from passionate rotary heat. Yes, the NTK sensors are money - but they're worth it. The powerdex units do not use EPROM chips though (preset on each sensor) you simply recalibrate the unit after plugging in the NTK sensor and drive.
NGK has a 0-5v output also. Also of note - the Powerdex measures down to 9:1 AFR.....not that you need to measure that
but I found it nice to know how far below 10 the mixtures were when shaping up a fuel table. (or measuring BDC's cruising tune ratios
)