The short answer is no. The computer on the 85 is an idiot, operation of EGR only. Tach signal does run through that "computer" in the pass side kick panel. Tack signal is picked up from the front damper pulley. It will all work OK if the 83 had a three wire tack like the 85 does. That is about where they changed from the two wire to three wire. If the 83 was a good runner with its current pump, leave it alone. If not, now would be a good time to change it, while they are out of the cars. Remember, re-install and re-timing, is not for the faint of heart.

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Junqueyardjim
Christianity, if false, is of no importance, and if true, of infinite importance. The only thing it cannot be is moderately important. C.S. Lewis



1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA

2003 Jaguar Type X, AWD. beautiful, good mileage,
Mom's car, but I won't let her drive it!