Re: digital tachometer
Set it to one. It's asking for a number to multiply the RPM by. For instance, if you had a 4 stroke motor then the spark plug would only fire every OTHER time the engine turns over, therefore it would have to multiply the fire rate by 2 in order to show up properly.
It would also be different if you had more than one cylinder, like a V-Twin motor or something. But for a simple 2-stroke, just use the straight fire rate (multiply by 1 = no change).