These are cheaper than I thought, http://www.amazon.com/APSX-D2-Digital-Wideband-Controller/dp/B00NBYSTSC/ref=sr_1_sc_7?ie=UTF8&qid=1418901382&sr=8-7-spell&keywords=os+wideband+sensor+gauge&pebp=1418901406687

wow - seems like a good deal. been wanting to set up a sensor but hesitant about the cost. anyone have experience with this brand?

Cost is a relative term. Not sure if you could have a better tool in your tool box for a carbed engine for 200$. It's not a tool that just lays in your box and you only use it once every other year. You will be staring at it all the time inside your car watching how your engine devours fuel under every load.

Anyway, if you read reviews, it is like anything else, you get what you pay for. Sounds like AEM is the way to go. I have had good luck with my Innovate, but replaced o2 sensor twice.

AEM 30-4110 wideband O2 comes with interchangeable face plates & the weld in bung, for $25 more.

 

A nice addition for a turbo car with a tunable with an EMS.

I could use one in my FI 280 with a tunable CTS via the potentiometer I have then another in my carbed 240.  OR figure a way to temporarily install just one for both cars?  Or buy 2.

 

More ideas than time. 

I bought one of those APSX units but haven't installed it yet, it looks like good quality to me.

I'll post more when I get it installed.

Chris

AEM 30-4110 wideband O2 comes with interchangeable face plates & the weld in bung, for $25 more.

 

A nice addition for a turbo car with a tunable with an EMS.

Agree completely.  I own the AEM unit, and have had it in the car since April without any issues.  It's reliable, and it works.  Worth paying the $25 more for a product of known quality.