Over the years, I have had maybe 2 to 3 dozen e24, e28 and e23 instrument clusters apart for various parts replacement or repairs.
I have NEVER had an issue pulling the little black plastic plug out of the tachometer before this afternoon. I am home with Covid, so have some time to catch up on some non strenuous projects. Instrument cluster is about as non strenuous as it gets.
So this plug would NOT come out without some serious force. I finally got it, but one of the "s" shaped connectors ended up coming part way out with it. I was able to bend it back close to its original shape with some small needle nose pliers. Have a couple of questions;
What the hell is the purpose of this plastic plug. I don't see that it does anything other than hinder removal of the tach from the rest of the instrument cluster. Does it push those connectors to make contact with something else? I didn't take the tach apart any further. Secondly, has anyone ever put a cluster back in without this plug? If so, what was the result?connectors.jpgclip.plug.jpg
It is a coding plug. Got no idea what it codes.
I think you are correct. I see how it works now. All ten of the metal tabs make contact with the printed circuit board. When you install that plug, it breaks continuity on three of the tabs. The other seven make a connection through the rectangular holes.
clip.plug.jpg
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try this pic.
codeplug.jpg
Ah, learn something new daily.
I guess it helps code the fuel efficiency meter and tach. Say low RPM like the Eta, modest like ours, or higher like the M cars.
I make E23 parts.
09/1983 745i (stolen spring '13 around Houston, TX Achatgruen on nutria buffalo. 8481080)
10/1984 745i
11/1984 745i
11/1984 735i (10:1-265/6)
Ford, MB, and GM round out the pack.
Erik aka
Hit Man X I live in Georgetown TX will you please contact me, I was a young engineer on the E 23 B 106 platform and still have the car I bought new in 1982
kent_goldy@yahoo.com
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