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I just picked up an m50 and really want to do this mod. Have you got any details in the wiring setup? Did you have to cut off the plugs from the tach and just jumper into the factory harnesses on the m50? Any help or pics you can give would be awesome! Thanks!
 

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I bought a tach off of craigslist yesterday, should be to my house today or tomorrow. I have the full service manual for the m50 so the wiring diagram for the m109 should be all I need. Hoping to begin the project this weekend, so any help you can give is awesome! Thanks a lot!
 
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