Googling and finding out something and copy pasting on the forum.... anyone can do.
http://uk.answers.ya...06131303AALJzO4
Next time, at least try to find the answer for the correct question. Thank you!
Edit:
As for the question, I agree with Schiffer and the rest who said that balancing and an alignment is necessary.
For the second question, I think the Allion has a speed sensor and not a drive cable connected to the speed o meter. So this should not affect your speed o meter reading. Experts, correct me if I'm wrong.