adding cruise control to a 5 speed

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I have made it down to the to the last few problems on my conversion. My donor truck was a 91. 5 intercooled 5 speed without a tach or cruise. I added a clockspring, the switches, a brake switch and a vacuum module. I have a new engine computer and still no cruise. It is not getting any signal out of the computer. Was cruise even offered on a 91. 5 intercooled 5 speed and has anyone ever added one to there truck? I need some help here. :{