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You may or may not need to use the rpm module, depending on your ignition system, but FAST includes it for your convenience. The provided module is used for a distributor and coil-type setup but you can use an HEI or MSD ignition-style box in place of the rpm module. Make sure you read the instructions when you get ready to install your rpm signal because there are several ways to wire the signal. You could cause damage to your ECU if you don’t wire the rpm signal correctly.