http://www.allproducts.com/manufactu...911154234.html
probably can score that for pretty cheap if you contact them. I was introduced to the Wideband output signals from a friend a while ago, he said Zeitronix also has them on their kit just to offer an alternative to the LC1.
The SMT8 should work as well as long as it has the programmable outputs as well, this piggyback was also recommended to me by the same person who told me the AFR Gauge trick. The SMT6 that they discountinued can be found for around $150-$200
In theory it should honestly work if the ecu doesn't freak