I'm wondering if there is a way to use the spedo from a 300D n/a in a car with a 3.07 diff (the one from a 300D turbo). I know how to modify the odometer gearing so that it is accurate, but is there any way to modify the spedo so that it reads accurately?

As it is now I assume that the spedo will read 45mph when it's doing 55mph.

__________________
Onus probandi incumbit ei qui dicit, non ei qui negat

I recondition w123/w126/w124/w140/r107/r129/ steering boxes!


1984 300D "Elsa" odo reset 6/2011 147k
1983 300TD "Mitzi" ~268k OM603 powered
1995 E300 "Adelheid" 262k [Sold]

No. Just use the correct speedo and change the odometer to match.

the speedo is a friction wheel design, no way to alter it from it's design. should be no problem finding a speedo from an 82+123 to fit in there.

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Magnetic drive, actually.

82, 83, 84 300D used the 3:07 differential

85 300D used the 2:88 Differential.

Charlie

__________________
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

Thanks for all the replies. The problem is that the car is a 240D with a '82-'84 300D 3.07 diff. The spedo from a pre '82 300D n/a would look perfectly and would display a more realistic speed range (0-85mph).

So without serious modifications and making the spedo/odo unit less reliable I think I'm stuck using a 300D turbo cluster.

__________________
Onus probandi incumbit ei qui dicit, non ei qui negat

I recondition w123/w126/w124/w140/r107/r129/ steering boxes!


1984 300D "Elsa" odo reset 6/2011 147k
1983 300TD "Mitzi" ~268k OM603 powered
1995 E300 "Adelheid" 262k [Sold]

The turbo spedo will have the black center cap on the needle. I think the 240 uses the silver cap. some times the caps will come off easy. I have had a few fall off, think the glue has got old and lost it grip. or you can swap the needles.

before you pop the needle off. lift it over the resting peg, and see where it rests. should be a little white mark on the edge of the face. needle should line up with that spot. replace the needle in the same place, then lift it back over the peg. i had to redo my 85 a couple times to get it to read right.

you mention you want the spedo to look correct (85 mph). I have a 150mph in my 240D .

Charlie

__________________
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