I added mine. As stated above it is a straight forward project that you won't regret doing if spending time on the road. The floor board area on 81-91 had a dimpled area where you need to put a hole for all the harness and vacuum hose, has a large grommet on the harness to fit the hole. If you find one in a yard, make sure you get all the brackets , brake switch and bracket, module mounts to the brake mount on right side. the fun part is fishing the column for the cruse stalk.