Hi Rob,
I used the e30 speed sensor on the diff for my speedo and it works fine.
I ran a twisted pair of cables from the diff. sensor all the way up to the speedo. I think I grounded one side, near to the dashboard, to avoid the whole thing acting as an aerial. Initially, I got some intermittant readings (luckily not during the SVA test!) which turned out to be a poor connection between the sender and the plug in connector. I took the sensor out and soldered some leads to the terminals and then filled the void with silicone rubber. No issues since doing this, but not many miles since this mod.
I used an american made Autometer speedo, but I think Stuart has also sucessfully used the BMW sensor and I think he has the Marlin supplied dials?
cheers
Peter
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