are the fr-s speed sensors a gear or magnetic? Alot of newer cars have been using magnetic ones, and in that case if you ever needed to re-calibrate it you can buy a speed healer.. I have one on my civic.. Pretty easy to install, was three wires iirr..
http://www.dakotadigital.com/index.c...rod/prd126.htm
install it, hop on freeway, have passenger adjust it by pressing up/down buttons..