MSD 89952 RPM Module/Chip Tester
MSD 89952 Diagnostic Scan Tool
RPM Module/Chip Tester
If you are using a MSD ignition box or rpm module, you need to have one of these rpm checkers. Each tester operates on a single 9 V battery and is simple to use; you just plug it in to your MSD ignition box or rpm module and hold down the button—that's it. MSD rpm module testers are essential for any racing class with rpm limitations.
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