84 and 85 300D have the tach Pick up off the adaptor plate between the eng and transmission.
84 and 85 have the Rack Position Sensor on the back of the IP.
These feed into the Black box behind the pass side kick panel the 84 and 85 have, this send a sig to the EGR.

84 and 85 have the ARV valve on the turbo.

I believe the 84 and 84 SD is the same.

80 240D is the last yr for the older style door check.

83 last year W123 available with a Manual Transmission.

82 240D last year for manual window winders. noticed electric windows in some 82`s.

79 last year for the older style steering wheel with ribs on horn cap

79 last yr for the oil gauge in PSI and the Temp in "F".

80 first yr the low fuel light went from red to orange.
Charlie

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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works