O2 Sensors, Ad Nauseum

[Simon Favre <simon@domain.elided>]

It was pointed out that when fitting an O2 sensor, stock or not, you
need to use the sensor-safe grade of anti-sieze. Some actually come
out of the box with a layer of it on the threads already.

Another point for those adding one to a Spica or Weber car, make sure
whatever fitting you weld to the pipes has a hex head on it. Use a
wrench to hold it still while fitting or removing the O2 sensor either
with another wrench, or the special O2 sensor socket. You don't want
to torque the sensor bung right off the exhaust! That's another reason
to use the 18mm spark plug non-fouler. The hex head is in just the
right place.

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