I just cut the end off my tach cable,tapped the hole and put a small cap screw with an o-ring and some blue loctite and then cut an o-ring groove in the o.d. of the housing. No oil leak for me. I also took 2 pieces of 1/8" X 1" steel strapping and made my own speedo mount to center it. Took about an hour to drill the holes, bend and twist it to suit and paint. I think mine looks good and it holds the speedo very solid. No problems with viberation at all.