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And that solution is this TRG-02 crank sensor conversion harness from Lingenfelter (PN L460065397, $254.95). This little magic box allows engines with 58x reluctor and 4x cam triggers to communicate with older GM computers. It’s a plugand- play deal with the only wiring required being to hook it to ignition-switched power and ground. Trust us, it’s far easier than pulling the crank.