The only time you will use the tach is if you do your own work, setting the pilot screws or balancing the carbs. Other than that, you will learn to shift by ear, depending on how you ride. If you like to wind it out and want to shift just before the rev limiter kicks in, you will find 2 things: The Triumph tach is like the speedometer - not the most accurate instrument, and, when you're heading for the rev limiter, the last thing you want to be doing is staring at the top of the fuel tank.....
