As best I can tell this is the progression of cruise control in the 123 diesels (sedan/coupe/wagons)

005 545 12 32 (Vacuum)
001 545 79 32 (Electric)
002 545 32 32 (Electric)
002 545 91 32 (Electric)

The EPC will commonly omit the previous two from listings as they've been replaced with the 91 32.

The 003 545 86 32 wasn't seen until the mid 80's when the 300SDL came around. I dont even think it was around in 81.

Internally the 003 545 86 32 is similar in layout to the 002 545 91 32.

Strangely enough your chassis is the ONLY 123 that "got" that amplifier...Which makes it kind of suspect.



Here is a similar transition year car the 240D:

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82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k