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Been thinking about adding O2 sensor(s) to help with tune up and performance.  I've been looking around and there is such a wide range on pricing and functions.  Lambda vs air fuel ratio, single vs dual sensors, units which also show rpms. I saw on Summit that Innovate makes a digital dual gauge to read both sides of the exhaust and you can select lambda or AFR.   Also be nice if  it could be used with a EFI down the road.   Searched the site but not a lot on who has what.   I was wonder who is using what out there.  Also weld on bung or if clamp on type would be okay.