Welcome, Kyle. My 1986 was that way, but has been modified [Duraspark system]. My son has a 1984 which is has the feedback system, like yours, in that it is still stock.
Gary, I cannot copy the photo of the NOS intermediate duty speedometer in my truck. It shows what the km scale looked like originally. You photographed it and it can be found in the Truck Show thread dated 11/13/18. Please make available so the others can see.
Thanks!