NO. The speedo gear will only get you CLOSER to the speed you are actually going. At speedo reading 65mph, you are only going 60mph.
You will have to pull your gauge pod face plate off and reposition your speedo needle. Use your fingers and just pull the needle off from the round black piece.
You can either have a friend pace you or go find oneof those road side MPH info trailers. I prefer to have a friend pace me. Also have someone else in the car with you to watch the traffic as you drive.
Find a nice quiet stretch of highway and have you and your pace car frined set the cruise at 65mph. Put your needle back on gently, not pushing it on all the way, at that speed when you are going the at the same pace. Also pull the 0 mph stop out, and when you stop the car and turn it off, push it the rest of the way on.
Go out and check your needle palcement again by having your frined pace you at the agreed upon speed again.
Or do what I did, find a speed trap and let them know your speedo is off!