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(More customer reviews)I installed this on a stock 2 barrel carburated 1968 Ford 302. I discovered this is a "narrow band" unit rather than a "wide band", as many other air-fuel ratio monitors are. Apparently the narrow band units will only read a very small range of air-fuel ratios which must be near 14.7:1. Because my engine is an older carburated type, the carburator does not provide a constant and stable fuel mixture at all power and loads and it does vary from a constant 14.7:1. The K&N indicator flashes and goes blank regularly depending on throttle and load and provides little information which can be used or interpreted. This unit is almost useless for me. It might work on a newer fuel-injected engines but is of no value in an older engine.
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