Electronic speedometer calibration (W124)
 

Greetings,

With the recent talk of 124 differentials in other threads, I want to throw a related question: Where is everyone buying their speedometer calibration boxes now that Bergwerks is gone?

I have recommendations for the Yellow Box (thanks, gsxr) but notice it's a slice-n-splice solution that will result in internal wire breaks if I'm not a neurosurgeon. Are there any boxes available with a 4-pin passthru connector already wired?

Alternately, can you do something clever with a pin-compatible speed sensor from another vehicle (W140)?

VR,
-DM