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electronic speedo woes

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My chevy truck is equipped with a electronic speedometer that ran off of a 40ppr setup in the original transmission.I have replaced the drivetrain with one that is a cable style speedometer .Is there a device that will mate
the two together?The other problem is that the driveshaft turns about 3.25 times to 1 turn of the speedometer drive. Any help is greatly appreciated. :?:
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