All the tools and instructions needed to precisely set Model A Ford timing using your timing light. This kit includes a crankshaft degree indicator, cut out distributor cap for spark visibility, distributor cam adjustment scale (keyed to the distributor) with cam wrench, and spark plug wire insulators. A detailed timing procedure accurately measures existing timing then allows any desired crankshaft degree change to be made or changed reproducibly with precision just like the modern engines. Suggested timing settings and troubleshooting information are also included. Additional Crankshaft Degree Indictors are also available. This is a genuine Nu-Rex product.