I'd like to convert my 1980 280TE 4 spd manual trans with Mechanical Speedo over to a Getrag 717.402 5 Spd manual from an 84 280SL with a electronic cable output. I have the electronic speedo from the 280SL. Should I just need the original speedo to trans wiring from the 280SL, or is their more components needed? It also might be easier if I obtained an instrument cluster from one the years that the W123 cars had a electronic speedo, then trying to adapt the 107 electronic speedo into my existing cluster.
Can anyone be of further help?

__________________
83 280TE- 5 spd, 16.5mm rear sway
85 280SL- 15" Bundts, 5 spd

I would be really curious to know if a W123 has ever, ever been equipped with adigital speedo...

__________________
------------------------------------------
Aquilae non capunt muscas! (Eagles don't hunt flies!)


1979 300SD Black/Black MBtex239000mi
1983 300TD euro-NA. White/Olive Cloth-MBtex 201000mi. Fleet car of the USA embassy in Morocco
1983 240D Labrador Blue/Blue MBtex 161000mi

Try starting with 1981 300TD for digital Speedo W123 useage

__________________
83 280TE- 5 spd, 16.5mm rear sway
85 280SL- 15" Bundts, 5 spd

Job complete. Used mid 80's Euro 123 speedo, 3 wires to hook up between existing harness & Speedo Trans Hall Effect Pickup

__________________
83 280TE- 5 spd, 16.5mm rear sway
85 280SL- 15" Bundts, 5 spd

Hi,
I obtained a partial wiring harness from a W126 car. From the Trans Speedo Sensor the White Wire is G+ & the Brown wire is a ground & both attach to the Electronic Speedo. There is a Black wire coming off the Speedo Plug, as well. This is your 12 Volt source & should only be powered up when car is on. These are the only wires I needed to use to make speedo work. The needle reads dead steady, as compared to cable speedo's needle

__________________
83 280TE- 5 spd, 16.5mm rear sway
85 280SL- 15" Bundts, 5 spd

I have the same transmission i think. it's from a G-Wagon. where the cable speedo signal is from the transfer case rather than the transmission/gearbox.

I put it in my w123, but i have no speedo output from the transmission, help me please :'( it's blanked off where the mechanical speedoo output should be :'(

Math, see attached photos. The Electronic PU Plug that you'll need to source from a 1980's Mercedes such as a W126 or R107 car that already has a Electronic Speedo. The PU Plug goes into the Socket @ the RR area of the 717.402 Trans. Wire as outlined in previous post

Attached Thumbnails

     

__________________
83 280TE- 5 spd, 16.5mm rear sway
85 280SL- 15" Bundts, 5 spd

Check this thread here. I made these up for the 722.6 Transmission. But if you have a 110mm tri-lobe bolt circle then at least the wheel will fit and you would most likely need to fab a new sensor mount.

Connect 722.6 Transmission to Electronic Speedometer

__________________
To see my 129 parts for sale visit:
http://stores.ebay.com/The-Mercedes-SL-Store
John Roncallo