E3’s External 2-Step Rev Control enables you to set a lower rev limit when in the starting and staging lanes. Two easy-to-read rotary dials allow you to set the staging rev limit in 100 RPM increments while a bright LED indicator lets you know the unit is on and functioning even in low light conditions. It works in conjunction with the built-in rev limiter in the DiamondFIRE 6CDI. E3's 2-Step Rev Control allows you to set a lower rev limit when in the staging and starting lane. Right LED indicator shows unit is on and functionin in low light. Requires use of E3.1440 6CDI Ignition Box Crosses to MSD 8732 Additional Attributes: GTIN: 00857661006410 Extened Information: Packaging: Quantity of Each: 1.0 Package UOM: EA Dimension: 3.0000 x 2.5000 x 1.2500 inches