I have a tach for a R107 or W116 forsale. I tested the tach and clock and both are in good working order. The tach has a redline of 6500 so it fits any W116 or R107 with an 6cylinder motor(M110). I have pictures, if your interested make me an offer. Thanks

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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg

My 280SE has no tach - if I were to swap out the giant clock (which I kinda like, so I'm ambivalent) with the tach/clock combo, what else would I have to add? Flywheel sensor?

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kalpol
79 280SE
82 Fiat Spider 2000
81 Fiat Brava
04 BMW R1150RT
96 Jeep Grand Cherokee

All you would have to do would be run a wire from the small terminal box near the ignition coil and then run a 12V wire to the tach. Shoot me a PM and I can help you out some more, I just did this to my W123.

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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg

It's just like Mercy says you use the same clock wire for clock run one lead to a power source and the other lead to the negative side of the coil or the TD juction box.

I just love my tach clock combo I had a big clock and changed it wouldn't go back. I look at the tach more than the speedometer. plus the tach Mercy has has the silver cap to match your other guage.

can't go wrong, If you change you mine just sell it on Ebay or here.