The car is pre wired for cruise control. You need the column switch, vacuum pump, throttle reel, bellows, some tubing, pedal switches and the control box and fly lead.
As to whether the intermittent speedo will be an issue it depends. The cruise looks at the ECY speed sigmal. If there is a problem with the tone ring in the axle it won't work properly. It won't care if the speedo itself is faulty.
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