Mike J,
If you want the best use a Rostra unit. I have one in my Chevy and its AWESOME!! Easy to follow install. Works better than factory and will pull your truck into the next dimenstion on acceleration!! Cost $250.00 for my unit. Worth every dime.
Check out my install
http://www.geocities.com/abetterchemist/cruise.html
I have the $89.00 dollar version mentioned above on my Dakota. Works great for flat highway driving. Stinks on hills, but I think only because of the V-6 engine. I need more vacuum to pull the throttle on hills. I have not tried to fix the accelaration on hills but these aftermarket kits work pretty good.
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Gerardo
1983 Custom Truck
TX Plates: "BAD BOW"
http://www.geocities.com/abetterchemist/