Points & OEM Ignition Systems:
The MSD Soft Touch #121-8728 rev limiter is designed to be used on standard points ignition or inductive ignition systems such as GM HEI, Ford or Chrysler electronic ignition.
The MSD Soft Touch #121-8738 rev limiter is for severe duty racing applications and equipped with a special 4-wire connector to plug into an external rev limiter that is designed exclusively for the MSD 6T, 6TN and 6-HVC Ignition Controls.Features:
One tab says no rpm chip needed, the next tab states it comes with 3 modules. Can it go both ways?
WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.
WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically treated lumber. Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.
WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.