On a module-based ignition control the rev limit is set by whichever module is plugged in, so a single module locks you to one number. This kit covers the 8,000 rpm range in odd 200 rpm steps, which is where a high winding race engine usually wants its ceiling.

MSD 87481 8000 Series RPM Module Kit Features:

• Five modules covering 8,100, 8,300, 8,500, 8,700 and 8,900 rpm.
• Odd 200 rpm increments across the kit.
• Plugs into ignition controls that accept rpm limiter modules.
• C.A.R.B. E.O. number D-40-29.