Yup, pure genius. I know a gal that had to get one of these installed in her car. She would either pay some bystander or take her daughter along to blow into the damn thing.

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79 240D (no name yet) 203K Miles Maple Yellow
98 2500 4x4 HD Dodge 24 Valve Cummins TD
83 Chevy Van (Dead-Trans. shot)