Ignition Modules are PC programmable with eight-point fully definable wide open throttle curve and eight-point fully definable part throttle curve. Programmable limit in 50 RPM steps. Programmable dead cranking revs from 0 to 10. Programmable rear cylinder offset up to +/- 10 degrees. Specifications: Data recording features include total engine hours, time at wide open throttle, number of engine starts (two minutes of running counts as one), time operating at wide open throttle, maximum RPM, seconds near limit, and statistical analysis of time at RPM. Part Number: 53-644 Fit for the following models: Carbureted Big Twin models from 19701999 and 19712003 models, excluding 1200S Sport. Not compatible with EFI models. Material: Metal + ABS Color: Black Package Contents: 1 x Ignition Module Note: Light reflection and different display settings may cause slight color variations between the item and the image. Measurement may vary by +/- 1-3 cm.