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I don't know how much current the tach draws, but I can't imagine it would be very much at all. The light bulb in the tach probably draws more current than the tach itself. If it were to draw too much current, you'd blow a fuse before you would see ignition problems. Well... you'd see ignition problems when you blew a fuse! :lol: I've gone thru several tanks of gas with no problems. If you're still concerned about current draw you could simply not hook up the blue wire (light bulb) or you could wire the power for the tach and light bulb in with the headlight circuit. Although I think this would be a waste of time.
In my VW Beetle the tach, ignition coil, fuel shutoff solenoid, and the electric choke are all powered from the same circuit. I haven't looked at the schematic for the GZ250 electrical system but I'd imagine there is more on the ignition coil circuit than just the coil.
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