W123, SVO/WVO parts

On my drive in to work in my WVO-powered 1983 300D-T this morning, I had been driving on the freeway for just about 5 minutes or so and all of a sudden the car started losing power! I was worried that the transmission was giving for a moment, since that's been a "watch" item, but the revs didn't shoot up like a typical "flare". The guts just went away and the engine was not spooling up. But the engine didn't quite die... Nervously, I stomped the accelerator for a moment and it seemed to "fight through it" and the power charged back, and right then a curious thing happened... The fuse carrying the tachometer blew out right when the car came back to life as if there was a surge. Related? No?

I'm sure this has been addressed in the past but I didnt see it. I recently purchased an 84 300D Euro. I noticed right away that when I get up to highway speeds (70 mph) it seems to run at very high rpm. I checked that it is shifting through all the gears so it seems to be a rear end problem??? Is this something I can do by myself and what can I expect to pay for one? Any advice is much appreciated.

Hi there. i recently purchased for my first diesel mercedes a fine specimin. It is a '83 300D Euro version, with a 4 speed manual. To make it even cooler, it had a turbo engine correctly installed some years ago. Anyway, it seems as if i will need a clutch very soon. This car technically doesn' exist in the parts lists. I have been told that i may not know what clutch it needs until i take it apart. My question is if anyone knows what i need and where to get it? Is it the same clutch parts as a 240D? Any help would be appreciated.