MSD 7551 Launch Rev Limiter Switch Box for Programmable Digital-7 Plus Ignition

The MSD 7551 Launch Rev Limiter Switch Box gives racers the ability to change their launch RPM setting on the fly — no laptop or ProData Software required. Designed for last-second adjustments to track conditions, this handy controller plugs directly into the RS232 computer harness and puts full launch RPM control at your fingertips.

The unit features two intuitive rotary dials that work together to dial in your exact target: one knob handles coarse 1,000 RPM increments while the second fine-tunes in 100 RPM steps, covering a full range of 1,000 to 10,900 RPM. Whether you're staging on the line or making last-minute tuning calls in the pits, the 7551 lets you lock in the perfect launch RPM without interrupting your workflow.

Key Features:

• Instantly changes the launch RPM setting of compatible Programmable MSD Ignition Controls
• Two rotary control dials — one for 1,000 RPM increments, one for 100 RPM increments
• Adjustable from 1,000 to 10,900 RPM in 100 RPM steps
• Connects via the RS232 computer harness — no software needed for adjustments
• Compatible exclusively with programmable MSD Ignition Controls and Accessories (including the MSD Programmable Digital-7 Plus, PN 7531)
• Sold individually

Note: The MSD 7551 is designed for use on uncontrolled (non-emissions controlled) vehicles and racing vehicles only.