i'll be taking my engine and transmission out in about 6 weeks to fix my rear main and was hoping to take this opportunity to work out my transmission conflict. before i owned my 85 300d cal. someone replaced the motor and transmission with that of a 84 300sd leaving me with no way to count miles or tell how fast i was going. i have the old 722.416 that shifted fine 7 years ago but spent at least 3 out side in the elements on its oil pan like it was dropped from the car. is it possible that its worth putting back in? or does anyone know a way to hook the 722.303 to a electric speedo and tac?

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84 300sd 2.47 dif 360k
26 mpg needs lots of love
given to me in pitty

89 civic hatchback auto 140k
33mpgs soon to be low to mid 40's
been in the family since mile 1

85 300d with unknown knock. driven over 30k with knock and still going. sold for $800