You need the extension from Mitchell.It has the gear on it.You have to order it for either a round,or an oval speedo.The downstream end,(on the splitter)is not A.A stock A end is not going to fit in there.
Keith, it only takes one picture and yours shows the Mitchell cable pretty good. I believe Mitchell uses later model Ford gears for mid 70-80 Ford transmissions. Looks exactly like the one in my '55 Ranchwagon except for the color. The different color gears are for different rear end ratios. Color indicates the number of teeth.
I bought that Mitchell unit for an oval speedo car.I never put it in,and when that car was gone I put the OD in a round speedo car.I had to buy the correct extension/adapter for the later car.I had taken that picture because somebody was interested in buying that part.That fell through,so it is sitting in the shed.I'm just going to keep it around,I have no idea what car the OD will go into next.