Speedo or the Cable??

[skahide]

Ever since i bought my truck none of the guages have worked, but the lights have. I tried about 5 months ago to see why the speedo wasnt working but the truck ended up dying on me, so i was side tracked for a couple months with getting it going again. well now its up, and i need a speedo. I have cruise control but it doesnt work. so the cable is in two parts with the cruise control inbetween. I can never get the cable to actually snap in to the back of the speedo. So i dont know if it is the cable or guage. What would you do first, get the guage or a direct cable from the trans to the guage? How hard it is to install a speedo cable? i have NO trans experience.