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As an example, we'll use a drag car with a Three Step Module Selector plugged into the rpm socket of a 7AL-2 Ignition. When the line-lock button is released, the limit turns off. When no modules are selected, the remaining high limit is active to protect the engine in the event of driveline failure.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.