Usage Tips:Ignition Modules are also PC Programmable: EIGHT POINT FULLY DEFINABLE WIDE OPEN THROTTLE CURVEEIGHT POINT FULLY DEFINABLE PART THROTTLE CURVEREV LIMIT PROGRAMMABLE IN 50 RPM STEPSPROGRAMMABLE DEAD CRANKING REVS 0-10PROGRAMMABLE REAR CYLINDER OFFSET, TOTAL OF +/- 10 DEGREESSpecifications: Data Recording: TOTAL ENGINE HOURSTIME AT WIDE OPEN THROTTLENUMBER OF ENGINE STARTS (TWO MINUTES RUNNING COUNTS AS ONE)LONGEST TIME OPERATING AT WIDE OPEN THROTTLEMAXIMUM RPMSECONDS NEAR REV LIMITSTATISTICAL ANALYSIS OF TIME AT RPMPart Number: 53-644Fit 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 ModelsMaterial: Metal+ABScolour: BlackPackage Contents: 1 x Ignition ModuleOnly 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.