Autometer A/F gauge question

Well, a few things:

The gauge was FREE. I never really planned to install one originally. But, I figure what the hell, it's free (Ok, maybe not if I have to drop $200 on sensors).

I don't care too much about datalogging capability. This is not a race car. It'll see the track, but not very often. But, your saying a narrow band isn't even good enough for BASIC engine tuning??

Maybe I'll save the money, and put some other gauge in the dash (I have a new custom 3 hole/1 DIN radio plate). I was planning on A/F, Volt and Oil pressure guages. Maybe I'll go another route. Trans temp? Better temp gauage?