O2 Sensor, what to buy? Options

[bbrock]

First, apologies because I know this has been covered somewhere but both local and Google search have failed me.

I'm heading to uncharted waters. All I know about O2 sensors are they are handy for measure A/F for tuning carbs and where to mount the bung. I have no clue about what is a good affordable sensor to buy for tuning a set of 40IDF Webers for a 2.0L engine. Don't even know whether wide band or narrow band is best. Just clueless really. Help Please!

[Mark Henry]

This is what I've wondered about a O2 meter rental service, more than just a meter rental, include in the kit jets, jet reams, jet gauges, bungs, bung plugs, sync snail, etc.
For carb guys you only need all this kit for is tuning, once you're done it can be a lot of expensive of kit that is almost useless.

I figure any parts used could be done à la carte, the kit could be direct shipped to the next in line and the bung could be shipped before rental date so you have lots of time to get it installed before hand. Likely I'd want a deposit that covers the value of the kit, with a balance refunded once the next person gets the kit. This method I'd likely have to service the kit at least once a year, although I'd likely include a extra lambda in the kit.
If successful I could bring on line more kits, I'd likely have at least one meter in reserve just in case of issues. I'm thinking a 3-4 week rental so you have lots of time.

Right now I have a meter with a very easy, built tough and stealth temporary install cable, with two simple connections (keyed power and ground), not counting the bung it installs in minutes. The cable is long enough to use on just about any car and the meter works on any fuel.

Big question is what would a kit rental like this be worth?

BTW I have asked this before but no one seemed interested, if there's no interest I wont bother.