Wideband AFR's gauges are absolutely critical if you want to extract every
last bit of power out of your motor and keep it safe. However, you should
still learn how to read spark plugs as they will tell you things that the
wideband won't.
As far as unleaded vs. leaded goes, the sensors have no problem with leaded
fuel, but you should replace the sensor after two seasons of use. I think
replacement sensors are about $80. Cheap insurance considering the damage
that an over-rich or too lean condition can cause.
Also windband sensors are absolutely worthless if they're not calibrated
properly. Anytime you mess around with the exhaust system you should
recalibrate it. If access is easy, it's a 2 minute job.
Lastly, you can hook up your AFR gauge to a data acquisition system and
record what your motor is doing real time around the track. For those
without a data system, put the gauge in your in-car video's line of site so
you can see what it's doing. Hope this helps,
Bob Adams
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