How does the car read its speed? I plan on doing an entire GT/Cobra swap (form V6 to V8, from auto to manual transmission, etc) on my 4spd auto V6. I'd like to know so I know what to change in order to be able to accurately read my speed and RPMs. If its just the cluster and no wires and cables I can do it myself.

If I need to explain further to be better understood, please lmk. Thank you in advance.