Welcome to Toyota Nation, Bill!
Congrats on the purchase!

. Check out the Tacoma forum as there have been quite a few threads in regards to the installation of cruise control.
I've done a quick search for you, so have a browse through some of the threads in this link:
http://www.toyotanation.com/forum/se...archid=2782269
Apparently Toyota sell it as an option, so OEM would probably be best, but there are people using aftermarket units too.
Best of luck, and once again, welcome to TN!
EDIT: This may come in handy to you - It's the installation guide to install the OEM cruise control unit, including the necessary part numbers:
http://www.parksoffroad.com/tacomamo...isecontrol.pdf