MSD - MSD RPM Module/Chip Tester or any 2-bolt Hurst Pattern

or any 2-bolt Hurst Pattern Stick

500 in Stroke - External Balance - Cast Iron - 2-Piece Seal - Oldsmobile V8 - Each

23 Degree - Square Bore - Single Plane - Aluminum - Natural - Port Matched - Small Block Chevy - Each

AN Wrench - Single End - 16 AN - Aluminum - Gold Anodized - Each

MSD - MSD RPM Module/Chip Tester or any 2-bolt Hurst PatternIf you're using an 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 into your MSD ignition box or rpm module and hold down the buttonthat's it. MSD rpm module testers are essential for any racing class with rpm limitations.