Because the '67 GT has a later model engine and transmission in it, the original speedo does not read correctly.
On Saturday, February 17th, I pulled the original 1040 speedo from the car, and removed the mechanical workings from the case.
The gasket is shot, so I need to remember to replace that.
The original speedo is large face, and the 1280 speedo from a later year B is smaller, so a direct swap wasn't possible. I needed to keep the large face, but with the later year mechanicals.
With a soup spoon I popped the needle from each speedo and made the swap. The trip meter cable comes out the bottom of the original '67 speedo, whereas it comes out the back of the later model. I chose not to mess with that, because the mission was get this installed and tested that afternoon before the snow hit.
I had the swap done in about an hour, took it for a drive, and it's perfectly accurate up to 65mph. Had I taken it onto the highway, I'm sure it would continue to be accurate past that. And, no needle bouncing, so the cable is still good.
Next project? Fix the tachometer? Replace the seat cushions?