AFR guage

I want one just for tuning purposes. I guess I'm looking for one that will just show me "real time" AFR, whether it be idling, cruising or WOT.
I sure don't need something that's a pain in the *** to work, or something to obsess over. It seems like with today's gasoline, it's just too hard to look at a plug and know you're good.

I'm putting out pretty good HP and an extended lean condition could be a disaster.