What YOU want to plug into that "SPACE" (on the '84 190D) is: 003 545 69 05

Which must be the "Supersede To" number for Cornblatt's 001 545 81 05

******** gives you the correct part number when you plug in the Vehicle.

(And a much nicer financial monkey)

However as a "PathFinder" you will try the 190E fuel/kick-down,We may learn
that "RELAYS is Just Relays...An interesting experiment...I don't think any
SMOKE will be involved. It'll either cause the Tach and A/C to work or it won't.

EDIT: From Cornblatt's comparison diagram The Tach won't work
(PIN # 3 on the 190E relay should be "RPM output" (For the 190D),BUT
PIN#3 is blank so there will be no RPM.The A/C MAY work because the relay
MAY be able to compare the RPM input #2 with the compressor RPM #11.
ONLY if the Fuel/Kick-Down relay can make comparisons like the Klima relay
and activate the A/C clutch when the engine RPM and compressor RPM are
the same(or nearly).

Attached Thumbnails

   

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'84 300SD sold
124.128