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Message: <blockquote data-quote="TommyK" data-source="post: 372125" data-attributes="member: 100">Most engines usually have one cylinder that runs leaner than the others due to distribution issues. It is usually easily identifiable by looking at the plugs. On mine it is number 4.For safety sake you are always going to tune for the demands of the leanest cylinder, so the rule of thumb is to install the sensor on the side with the lean cylinder.Since it is nearly impossible to tune individual cylinder a/f ratios with a carb, I don't think the trouble or the expense of multiple sensors is warranted.If/when you upgrade to a throttle body FI system I would use the sensor that comes with the unit. The bung you weld in now should work with any sensor.</blockquote>