Depende sa gumagamit kung importante yung tach o hindi. I use the tachometer on my Adventure as a shift guide, so it's important to me in that aspect. Pero yung Adventure GLX ng biyenan ko, walang built-in tachometer, so determining shift points is usually done by gauging the engine sound. Wala namang problema.
You can always play it by ear kung sira ang tach mo, lalo na kung kabisado mo na yung takbo ng makina mo. Pero syempre, mas maganda pa rin kung maayos lahat ng gauges mo.