I went to an air-fuel meter, the K&N: http://tinyurl.com/76t9dlb I mounted two O2 sensors on the downpipes with a dash switch between the two. I agree this is the best way to go because you can watch each carb's mixture while driving. Note - you don't have to buy their O2 sensors - any single wire sensor will do. -- Steve Gerow Altadena, CA BN6