Anyone know how to take the tach amp apart? Mine is still being very flakey & I'm thinking that maybe some solder connections are coming loose like the ACC & Cruise modules. I looked at it a while ago & didn't see how to do it.

Thanks!

Mike

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Michael Roth

1982 300TDT Wagon
1982 240D Euro!, 4spd manual-Parts car now, dead engine
88 Jeep Grand Wagoneer-fixing up for offroading
1989 Ford F150 (rust bucket) For Sale!
1953 Dodge B-4F, 1 1/2 ton Stake Bed (new restoration project)

its potted in a silicone glop...not easy to remove or redo afterwards..

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Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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Section 609 MVAC Certified
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche

Mike,
Let it go. Everyone on this board will tell you they don't work except for a few individuals who have been smiled upon by some supreme being. You want something else that never worked? Try the cool removable combo glove box light/flash light in the first 450SLs.

Peter

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Auto Zentral Ltd.

I screwed with that stupid thing 2 dozen times over the years, for about a 2% success rate (total). The last time, I actually had some success. Instead of foam under the cap, I used a wavy washer. Then, I crimped the sides of the pins (careful, I cracked part of one off) to try to get the pins to contact better. Now, it works 80% of the time, maybe more. Don't get your hopes up though. It's been 2 months now, but I'm still waiting for the other shoe. BTDT.

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'82 300SD - 361K mi - "Blue"

"Good judgement comes from experience. Experience comes from bad judgement."

listen, look, .........and duck.

remove the silicone carefully.i admit a rather tedious process.there you will find a small circuit board.examine this carefully with a high power magnifier and resolder any suspect joints.test it and if alls well reapply some silicone and congratulate yourself on solving one of the most irritating small problems that we MB owners face

It worked for me. Remove silicone you will find corcuit board. resolder alljoints. Se if work .apply silicone.

You can't use just any silicone....most weep acid when they cure....acid and electronics don't get along well with each other.

__________________
Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
---------------------
Section 609 MVAC Certified
---------------------
"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche

I found removing that silicone somewhat akin to cutting a tall, thin piece of tapioca pudding.

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'82 300SD - 361K mi - "Blue"

"Good judgement comes from experience. Experience comes from bad judgement."

listen, look, .........and duck.

I wonder what it woud entail to design and make a 'replacement' amp?

In my infinite wisdom, I reefed down on the cap one day to restore the tach to wholeness and managed to break my circuit board in two. I think that if I could ever figure out what components it took, I'd breadboard an amp and hard-wire it into place.

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Never a dull moment at Berry Hill Farm.

once you have it off just melt your fav. color crayon on the top of the board.

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have no worries.....President Obama swears "If you like your gun, you can keep it