Usage Tips:Ignition Modules are also PC Programmable: EIGHT POINT FULLY DEFINABLE WIDE OPEN THROTTLE CURVE EIGHT POINT FULLY DEFINABLE PART THROTTLE CURVE REV LIMIT PROGRAMMABLE IN 50 RPM STEPS PROGRAMMABLE DEAD CRANKING REVS 0-10 PROGRAMMABLE REAR CYLINDER OFFSET, TOTAL OF +/- 10 DEGREES Specifications: Data Recording: TOTAL ENGINE HOURS TIME AT WIDE OPEN THROTTLE NUMBER OF ENGINE STARTS (TWO MINUTES RUNNING COUNTS AS ONE) LONGEST TIME OPERATING AT WIDE OPEN THROTTLE MAXIMUM RPM SECONDS NEAR REV LIMIT STATISTICAL ANALYSIS OF TIME AT RPM Part Number: 53-644 Fit For the Following Models: Fits: S&S, for Harley Evolution, Ultima, Revtech, Shovelhead, & any Evolution based motors. 1970-1999 Carbureted Big Twin for Harley Models & 1971-2003 Sportster models except 1200S Sport. Will NOT fit EFI Models Material: Metal+ABS colour: Black Package Contents: 1 x Ignition Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.