Porsche 911 odometer speedometer gear mph 1976 to 1989 2.7 3.0 3.2 3.3 sc

This item fits different models of porsche 944 Please inspect your gear to find out the teeth count you need 20 x 30 teeth Here is a link to an assembly video (not made by me but by RAENZO PERFORMANCE) https://www.youtube.com/watch?v=iixiwnFBFb4&ab_channel=RAENZOPERFORMANCE