I am new at posting to this forum, however, I have been reading it for quite a while. Thanks to the folks who have answered, unaware, many of many questions.

I have engine wiring/vacuum questions for my 84 300SD. I have searched alldata but they come up short in many areas.

One of the POs bypassed the switchover valve for the boost control. Where exactly should it be mounted and do you know who would carry a replacement?

Also, can anyone tell me where the engine control unit is mounted and what is its function? According to the diagram in alldata, it is wired to a temp sensor, rpm sensor, switchover valve, vacuum converter and throttle position sensor. Much of this wiring is missing and I will probably have to search the salvage yards.

This is my first Mercedes and it has been a great car. I have put nearly 40K, with over 320k on the odometer, over the past year in business and personal use!

Thanks