I guess it really depends on how handy you are with tools and how much patience you have. I replaced my speedo earlier this year and it took me two days, and I almost gave up more than once.
I just don't have much patience for projects like that.
In reality, the hardest part is getting the dashboard to pull out far enough to be able to reach everything to get it all out. Once I figured out I could disconnect the tach cable (mine is mechanical on the 74, not sure about yours on the 76), things got easier.
Also, I had bought a whole dash piece on e-bay to get a replacement speedo (that I had reconditioned and set to the correct mileage), so I could really see how things went together. I'm a very visual person, so that really helped me.
If you're just changing the cable, that could be significantly easier. There is a clip on the back of the speedo that holds the cable in place. When you pull on it, the cable should come out easily. When you push the new one in place, it should lock there.
Hope all this helps!
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I wanted a Corvette my whole life, but I never dreamed of all the wonderful people I would meet because of it!
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