Are you a proud owner of a Moto Guzzi ‘Jackal’? Well, then you are likely to be an envy of many. But if you missed out on the benefits of a tachometer, you might just go by the sound and feel of the engine whether or not it was happy with the revs you are using during changing up or down the box. We can forgive you if you are clueless as to what those revs actually were. Read full story Please login to see links and more information..