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Old 01-03-2010, 09:14 PM
Registered User
Join Date: Mar 2005
Location: Vista, CA
Posts: 345
Anybody know how to wire up a tach?

With the bulk of the 240D 617 swap done, i am down to the little things. I have the tachometer amplifier connected to the front of the engine, and i have the gauge in the instrument cluster. Anybody know how to wire it up? I have three wires coming off the amplifier, a brown one, a black one, and a green with a black stripe. The back of the tachometer has three pins labled, W, -G, and +. Anybody know how to hook it up?


1979 240D with a 617 turbo diesel.
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Old 01-03-2010, 09:42 PM
toomany MBZ's Avatar
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Join Date: Nov 2006
Location: central Va
Posts: 7,820
You have the wrong tach, you need one with two prongs.
The one you have is a later unit that didn't use the tach amp.
Brown is ground.
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Anybody know how to wire up a tach?-tach-two-prongs.jpg  
83 SD

84 CD
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Old 01-03-2010, 10:04 PM
DeliveryValve's Avatar
Chairman of my Benz
Join Date: Jun 2006
Location: Central California
Posts: 4,135
As toomany MBZ mentioned, Yyou will need a 2 prong tachometer from an '82 or '83 300D. If you look on the tach port on your wheel well, you notice holes with numbers associated with them. #2 is gound and #6 is switched power and leads to the firewall. You will need to add in a wire for #3. Get the wire and plug for the back of the tachometer (instrument cluster) from the donor vehicle. The green-black wire from the tachometer plug goes to the #3 prong on the tach amp and the red-black wire is the switched power lead.

1983 123.133 California
- GreaseCar Veg System

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Old 01-04-2010, 02:47 AM
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Join Date: Mar 2005
Location: Vista, CA
Posts: 345
Awesome! thanks for the help. I will go to the junkyard and get the proper tach. This forum Rocks!


1979 240D with a 617 turbo diesel.
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