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It's certainly a lot easier to fool with the sender if you remove the alternator; I can't remember what size the hex is(19mm, I think), but don't try to turn the sender by grabbing it by the shell, 'cause it'll likely just spin rather than unscrewing.
An adaptor from 1/8" pipe to 14mm is required on B230 motors, and a 45 degree pipe elbow is handy, too; without it, the alternator won't move all the way towards the block, making belt changing difficult(not impossible).
In any case, be careful working around the back of the alternator; better yet, remove the ground lead from the battery.
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