Vehicle speed sensor

When doing a magnum swap I assume that some of you (or all of you) don't use the vss. Yes, no? If you are using a non computer trans do you even need it? Or is there some computer trickery that needs to happen?

When the vss went out in my truck the trans acted broken, cruise stopped working and of course the speedo crapped out. Just had me thinking as I mull this magnum swap over in my mind.