Originally Posted by
urbanknight
you could always just put one on the rear wheel and one on the front. It would be interesting to see if a front wheel travels measurably further than the rear (it takes the *slightly* longer route around corners, you know)
You need a computer that was designed for rear wheel use. One that was designed for the front wheel won't have enough range. You'd probably need to fabricate a pick up anyway to match a 145mm or 160mm tandem rear triangle.
Incidentally, I've got friends who have two computers on their tandems and they say the mileages never agree. The captain always rides farther.