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Old 01-28-2008, 10:52 PM
imagesinthewind's Avatar
I SK8 Roller Derby!
Join Date: Mar 2006
Location: Denver-ish
Posts: 953
Wacky Tachy

My tach goes nuts most of the time now.
Some days it tells me the RPM and sometimes it bounces
like it's dancing. Some days it just rests and tells me nothing.

What do ya think is the fix for this?

Ginny in Denver-ish
78 300SD, 265K (mine)
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Old 01-28-2008, 10:55 PM
Registered User
Join Date: Dec 2005
Location: Carson City, NV
Posts: 3,790
Try the cigarette butt fix. (covered in earlier threads, can find with search function) I did this with mine and it still doesn't work all the time, but it's on like 75% of the time instead of 10% like before. Best of all, it's free and easy. This is assuming the tach amp setup on the W116 is the same/similar to the W123.
Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 367,xxx miles
08 Triumph Street Triple 30,xxx miles, lowered 10mm in front, Pirelli Angel GT tires, EBC HH brake pads, otherwise stock.
88 Jaguar XJS V12 93,xxx miles. I should be in the garage now.
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Old 01-28-2008, 11:30 PM
imagesinthewind's Avatar
I SK8 Roller Derby!
Join Date: Mar 2006
Location: Denver-ish
Posts: 953
Thanks. I'll try this in the AM. I have a neighbor who smokes outside
on her porch every morning. I'm sure she'll give me a used butt.
Ginny in Denver-ish
78 300SD, 265K (mine)
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Old 01-28-2008, 11:40 PM
Registered User
Join Date: Jan 2006
Location: Denver, CO
Posts: 604
the cigarette butt worked for me... the hardest part is getting the thing out of the cap that you take off of the tach amp sender

OBK #12
1980 300SD 333,XXX miles - Totaled
1986 Mazda RX-7 212,XXX miles - impounded and auctioned off
2005 Jeep Liberty CRD Limited 33,000- SEGR, Provent, Fumoto
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Old 01-29-2008, 06:43 AM
toomany MBZ's Avatar
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Location: central Va
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I did something similar, worked for a while.
83 SD

84 CD
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Old 01-29-2008, 06:48 AM
Admiral-Third World Fleet
Join Date: Feb 2002
Location: Central FL
Posts: 3,069

You need to line up some pick-n-pulls in your area for bits and pieces like this. The cigarette but trick may work, may not. You will probably have to find another tach amp eventually.

80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)
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Old 01-29-2008, 10:39 AM
Phil's Avatar
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Join Date: Dec 2004
Location: Sonoma County, California
Posts: 1,064
After trying putting stuff in the cap and having it work for a few days and then going out again I took the socket that mounts to the fender off and crimped the sleeves that the amp plugs into just a little. This is the best, longest lasting fix that I have come up with and its been working for 4 weeks now. The problem with these is after years the sleeves get loose and no longer make good contact and when you put stuff in the cap it just pushes the sleeves farther out and makes them even looser.

1983 300SD
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