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The Haneline gauge is all electric, meaning the speedometer has no cable, but uses a pulse signal generator. The unit provided attaches on GM transmissions, such as the Powerglide, TH350, 400, early 700-R4, and 200-R4, directly to the speedometer drive housing at the rear of the transmission casing, and should be wired as per the instructions. The speedometer drive housing is shown here (arrow). The original cable would exit the yellow plastic part.