I had a VERY slight vibration in my steering wheel after installing the rear motor mount. But didn't even notice it after a couple of days. Give it a week or two, it should settle down. If it continuously bothers you then raising your idle speed by 100rpm should remove this vibration, but you would need an aftermarket tuning device to do this.
Ohh yeah a year and a half later and it still vibrates where I notice it, the Toms tune silenced it but I had to remove that about a month ago when I moved back west to KC,......I guess the 91 octane must have been messin with the tune. It was running so poorly I went back to stock and now have the vibration back.