Re: air fuel ratio meter
I use them all the time, and I think this is a GREAT way to tune a carb!!
If you get a second 'bung' and O2 sensor you can use a toggle switch to check both sides of the exhaust with the same control head.
This is not just a good way to tune a carb, it can also help you diagnose problems in the engine.
Several types now come with a 'Knock' sensor built into them so you get a two for one deal.
Edelbrock, MSD, Mr. Gasket, and a slew of others sell them.
The trick is to get one that uses a common, (read 'Replaceable') O2 sensor, so you can 'fix it' when something goes wrong, instead of having to buy another unit, or pay new unit price for a replacement O2 sensor.
If you get the kind that cleans it's self, make sure you have a large enough wire supplying the control head.
"I Have The Body Of A God... Buddha"