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350engine/ 1986 GMC T5 tranny, no speedo


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The above combo is in a 73 240. Tranny is a Borg Warner 1352-157.

The speedo does not work. Person who built it (friend) had died from cancer.

He did not hook up the speedo. The tranny has two (from what I can see) electrical connections on the drivers side. One further back (I suspect the pulse coder for a speedo?) and one up front (reverse switch??).

I need help to hook the stock speedo (changing out the electrical in back with something mechanical?).

Is the front electrical the reverse switch?

Thanks much!

Enno

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Welcome to the board.

Yes, the front connection is the reverse light switch.

You have 2 options to use the stock speedo.

1. Have the tail section of the tranny converted to use a mechanical speedo drive. This is what a previous owner did to mine so I lucked out.

2. Get a unit that uses the electrical output to drive a cable that will then drive your stock speedo. Here is a link to a place to at least start looking for one of these drive units. http://www.tciauto.com/electronics/index.htm

Look close to the bottom of the page, there is one listed there with 2 different cable setups.

 

Wheelman

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