The diesel Tiny Tach sold here is http://www.tinytach.com/tinytach/diesel.php is superb, They have updated the design and it no longer uses an internal battery, it uses 12V power, and updates much more frequently than previously.

The 6mm transducer is the correct one for our vehicles,

I cant recommend this product highly enough, its superb. If you need a tach for your 240D this is it.


Check out my comming diesel SEC buildup thread for pics of it in action.

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1984 Euro 300SDC, (4spd standard)
1986 Toyota Landcruiser Diesel HJ60 5spd X2

Gone but not forgotten (some sold, some stripped)
1983 300 SD, 1985 300 SD, 1983 240D, 1986 300 SDL, 1985 300 SDL, 1983 300 D, 1984 300 D, 1985 300SD, 1987 300 SDL, 1983 300 SD, 1985 300 TD Euro, 1983 380SEC, 1990 300 D, 1987 300D, 1982 300D, 1982 300D, 1994 E420, 1987 300 TD, 1987 300 D, 1984 300 D

sorry, so how does it attach? Particularly on a car with no dash tach?

It would be nice for troubleshooting and adjustment... plus the hour meter is good for operating metrics.

JMH

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
2008 ML320 CDI (199k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)

the old version was BS, the internal battery lasted <1 year, (prolly due to the hi temps inside the car.) I started out loving it and ended up cursing it.

It has a transducer that connects to one of your injector hardlines and it counts the pulses and displays your rpm.

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Cheers,
Robert

I did not want to buy it untill they updated the refresh rate and its lifespan, now it works great. It connects to any injector hardline, it seems to be very accurate. mine is mounted inside the gauge cluster, where the tach/clock was.

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1984 Euro 300SDC, (4spd standard)
1986 Toyota Landcruiser Diesel HJ60 5spd X2

Gone but not forgotten (some sold, some stripped)
1983 300 SD, 1985 300 SD, 1983 240D, 1986 300 SDL, 1985 300 SDL, 1983 300 D, 1984 300 D, 1985 300SD, 1987 300 SDL, 1983 300 SD, 1985 300 TD Euro, 1983 380SEC, 1990 300 D, 1987 300D, 1982 300D, 1982 300D, 1994 E420, 1987 300 TD, 1987 300 D, 1984 300 D

So nobody has a pic of their's.....

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John

Wow that looks like a very simple install. Too bad they don't have an analog gauge to match the rest of the car gauges. Either way for $100 it seems like a great addition.

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1974 240D 3.0L 4(M) - 250K -OM617.910 + 300D FW + Rajay turbo power!
1977 6.9 3(A) - 84k

For $100 it would be cheaper, easier and much more stock looking to get all the tach parts from a junkyard car and buy techguy's amp.

Would the 6mm transducer work for my 190D? The injector lines seem smaller than the 240D. Hope its not to dumb of a question.

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Dave

1985 190D 2.2 auto--gone
1975 240D 4-speed--storage
1985 500SEL--daily driver
1985 300TD--bad rust, soon to part out...
1982 300SD--waiting on engine from RD
1984 190E--storage
1996 Dodge 2500 Cummins--daily driver

injector line size should be 6mm, but measure with a caliper for sure,

And Forced, Its not always easier to go with a stock solution, I have an engine from an 85, a bellousing for a 240D, and alot of custom work, The tiny tach is better than a stock solution for me.

Maybe not for you, but you can read your rpm in 10 rpm increments.

With the hour meter feature if i ever have to lend my car I can tell exactly how long the engine was run for

This is the perfect solution for any engine swap situation where you cant get a stock tach solution to work.

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1984 Euro 300SDC, (4spd standard)
1986 Toyota Landcruiser Diesel HJ60 5spd X2

Gone but not forgotten (some sold, some stripped)
1983 300 SD, 1985 300 SD, 1983 240D, 1986 300 SDL, 1985 300 SDL, 1983 300 D, 1984 300 D, 1985 300SD, 1987 300 SDL, 1983 300 SD, 1985 300 TD Euro, 1983 380SEC, 1990 300 D, 1987 300D, 1982 300D, 1982 300D, 1994 E420, 1987 300 TD, 1987 300 D, 1984 300 D

None of which matters one bit, the stock tach system from a 300SD will install for you just as easily. Your engine already has the crank sensor mount and reference pin on the vibration damper. All you have to do is put in the pickup sensor, amp, tach from an 81-84 300SD, run two wires between the amp and gauge, attach the ground wire and connect the power wire to any switched 12V power source.

Nobody needs that level of accuracy. 50-100rpm accuracy is more than good enough.

There is no situation where the stock tach cannot be added or made to work in a W123 or W126 diesel.

This would be a better solution for a 300D/240D W115 owner unless somoene easily knows how to rig up a W109/W108 tach....

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1974 240D 3.0L 4(M) - 250K -OM617.910 + 300D FW + Rajay turbo power!
1977 6.9 3(A) - 84k

Only the 6.3 has a tach. The 3.5 and 4.5 don't have tachs. W108s don't have tachs.

Can a 6.3 tach be rigged to take the impulse sensor as an input?

Sixto
87 300D

Here is a write up FUNOLA did last yr installing a tach from a 300D to his 240D.

www.peachparts.com/shopforum/showthread.php?t=198138

this might help.

charlie

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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works

I do not know if this topic was covered previously, since no topic seems original anymore. I am thinking of modifying a regular (inductive) timing light where the light would now be triggered by the pulse from #1 injection from IP via tiny-tach pickup sensor. You can get a new timing light for ~ $10 on ebay and the tiny-tach sensor is $35 + some mods.

Tiny-tach website is www.tinytach.com

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2010 ML350 Bluetec
2012 Mustang Convertible

Tiny-tech already offeres a diesel timing light model 28060 for $469.

http://www.tinytach.com/design/timing.php

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2010 ML350 Bluetec
2012 Mustang Convertible