you're not wrong, you're just floating around in the non-sequitur lagoon matey.
the correction that the speedo gear makes is about the furthest thing this dude should even be thinking about at this point.
it has no bearing, effect, matter of importance or offer any issue in any of the following: building his 318, swapping in a magnum, selecting and installing a transmission.
this is like worrying about if the cigarette lighter works in a car you're going to buy. a benign issue that is not pertinent to the matter at hand.