I've been looking into the possibility of using the newer "with coding plug" style units on the older cars.
Here's what I've come up with:
The coding part sets the impulse per kilometer range for the unit (As evidenced by:
VDO Catalog Tempostat Coding Plugs) This range differs from transmission to transmission it would appear. The VDO numbers on the two plugs I have don't match up to that image at all. I've cross referenced MB stuff a bit and came up with the following:
My 300SD uses a
722.303/722.416 transmission.
These amplifiers work in it
002 545 16 32, 002 545 82 32, 003 545 86 32.
These units also work in a variety of other chassis, namely the
201.122,
124.120. The 190D 2.2 and the 200D/E200 Diesel respectively, both use the
722.403 transmission.
In the 190D 2.2, the amplifier was replaced by the newer 14-pin coding plug type with plug
005 545 11 32
So there is a chance that this 005-545-11-32 plug coupled with the 14-pin newer style cruise unit could be used in all 722.303/722.416 enabled cars.
I don't have this plug on hand, and its $40 from the dealer! So if anyone has this on their car. I'd love to get a peek inside at the resistors so I can order up some resistors and test this theory out!