i put one on my 1981 years ago. It uses brake air pressure converted to a electrical signal, just took it off of the 81 and moved it to the 1994. it is pretty easy to hook up, it needs a 12+, a ground then using a spare wire under the passenger side dash you run it to the trailer light connector, on the 94 there is a big blue wire that looks like it was meant to be used for trailer brakes.
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