The reason his tach only goes up to 4000 is because its a diesel. They make there power at a lower rpm, and they run on Compression Ignition, not Spark Ignition like your 2.0L.The Ford Diesel has a red line of only 3800, but make 525Ft-lbs at 1400 rpm.
I have a 95 Jetta 2.0L and at 3000rpm, im at 70mph.
One thing you have to keep in mind, its a Diesel.they were not ment to have a high rev range, but very capable of stump pulling. At 95kph(60mph) your at 3000, thats sounds a little high, should be like 2500 at least. At 115kph(72mph), 4000 sound about right give and take a few rpms. Your speedo reads a max of 240kph (149mph), you will never see that on factory components, my speedo reads 140mph and i had the thing up to 130 before the fuel cutoff kicked in.
There must be somethere wierd happening, because my gas milage is out the window. I can't get anywhere near 35 mpg. I mean, 1/2 a tank gets me 250-280 km. However, nothing seem wrong with the engine and the clutch doesn't seem to be slipping..... Wired... BTW, this is my 1st VW. Other this issue, I like the car.