Found the rubber conductors that had fallen off. Everything working fine!

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Hi! I am new here.
I own an W201, year 1985, with 2000cc gas engine, automatic gearbox.

The instrument cluster was without odometer (engine rpm) and without outside temperature display.
I found an odometer from other car (gas engine - it have the "economy" display, just like my car), and an outside temperature display. I did build a new instrument cluster with them.
Now, I have to make them work!
I did make the wiring for odometer "+" to "contact" position of ignition key, "TD" to alternator, but it don't have the "W" connector.
Also, the outside temperature display is working, but is enter in sleep mode because I don't know where/how to connect the "4" pin to the engine speed sensor or somewhere...
Can anyone help me, please?
...sorry for my rusty English...