I picked up a gently used (?) shifter thinking that may the problem with my 2008, I still only get 3 lines on the speedometer, The replacement unit came without a key, but had the tumbler still in place. I got it out and before I get the other one out, do I need to add a hole to release the key tumbler? I also have a red tool of sorts on the front of the replacement shifter, not sure what that is for. Any ideas??