Readings will be the same front and rear, assuming same tire size. They probably tell you to mopunt it on the front because the wire isn't long enough to reach the rear.
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Il faut de l'audace, encore de l'audace, toujours de l'audace
1980 3Rensho-- 1975 Raleigh Sprite 3spd
1990s Raleigh M20 MTB--2007 Windsor Hour (track)
1988 Ducati 750 F1