sc 02 sensor and g50 Q's

[porsche930dude]

I cant seem to find the specs for an sc oxygen sensor. Im trying to determine if mine needs replacement. I get .02 - .80v reading when heated with a propane torch. Im inclined to beleive this is normal seeing as how Whane's book says a 1.5v battery would make it lean out.

Also what is required to fit a g50 5 speed in an 82sc? On an unrelated note, is it terribly difficult to swap the ring gear in a g50 for a mid engined application? Thanks