Here is a method for a simplified throttle cable on the om606. It may work for other motors (I suspect the om605, om604)

https://www.youtube.com/watch?v=DDr96CfzNL8

Part 2

https://www.youtube.com/watch?v=AohBSUHAhlE

This was made for a better pedal feel, and I swapped a turbo block with a mechanical pump. As a result of the diffferent intake manifold I had to mock something up anyways, the real plus for me was that the pedal feel is much better.

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1995 E300 With:
OM606 Turbo
Merc 6 Speed Box
https://bit.ly/2sisie9