No you don't have to spend $1100. If you don't want to pay perfect pass price then you should check out Ride Steady at
www.hydrophase.com. Their price is close to what a rpm based perfect pass system would cost, but hydrophase gets it's speed reading via paddle wheel, plus you get the digital gauge. With the rpm based perfect pass, I don't think there is a gauge just a toggle switch (though I may be wrong).
Moon