[cobrakiwi]

Bill,
Check around the area behind the horn button, it will be behind the dash and up a little, so to keep it from hanging down below the bottom of the dash. Yes it is a cable that plugs into the back side of the Speedo, the knob on the other end twists to reset.
Your car was one of 4 cars being built in the shop but I am sure I installed it.
May be use a hand held mirror and flash light to have a look.
Cheers