Wideband and air/fuel ratio difference

Dart 67 said

and 14.7 is the right ratio that I should have when tuning my carb? (pardon me if it seem to be a stupid question but I am learning right now :read2:)

I have a deal on the cheaper one and I am planning to use Nitrous on the dragstrip next summer. I was just wondering if the air/fuel one will be helpful for me.

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For a naturally aspirated car, most engines like to cruise at around 14.7:1, but run better at somewhere between 12.8:1 and 13.0:1 at full throttle. Nitrous motors should be even richer when you hit the button for safety (and because there's a good chance one or two cylinders are a little leaner than the rest). With a narrow band gauge, fully pegged can be anywhere from richer than you need to be, to richer than 14.7:1 but still lean enough to melt a piston.