I know that. I have access to the parts needed. The pick up unit and the amplifier. I only need some guidance through the process. I also have doubt about the tach, is the same unit in both diesel and gasoline engines? I remember seeing a tach from a 300TD and I'm almost sure it had a 3-pin connector. The unit I have is for a 2-pin connector.

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1982 W123 300D NA Euro, 300K Miles, 4-speed manual, 3.46 rear diff, early W126 front brakes, Penta rims with 205/60R15 FH900's, custom fitted (by me) audio system, more to come into the money pit... Soon to be installed: Bilstein HD, R107 front discs and 4-piston calipers, HD Suspension springs, wagon front swaybar.