Adrian, the LED is only a visual reference aid in setting up the initial static timing. It is close to what you get with a dedicated timing light, but does have a slight delay of a degree or two because it is driven thru a resistor and transistor circuit. This circuit does impart a few degrees of error and lags behind slightly but I've been using it to just verify that the timing does indeed advance per the programmed curve. Onward to more important things like the curve itself. I've been using a programmed curve in a test on a DA 60cc aircraft engine. Ignition board is a CH board, very high quality, RCExl coil, and my timer board with my curve. We have it on a dyno, recording rpm, engine temp, and a timing light. With Nyemi's MSD curve, there is a 25% improvement over the stock ignition supplied with the engine by DA. This is being done by professionals in engine tuning at Boysen products company near my home town. Tests prove the validity of MSD over stock ignitions, combined with the advance curve we are using. If you need proof of this, I can put you in touch with the product designer as he is a personal friend of mine.

John