another option for those water sensors is to tap one of the side sensor block plugs.
the stock mercedes has something like 3 on the side, and another 3 at the thermo housing

tapping the side seemed easier then going w/and adapter or taping the thermo housing.

 

hmm the only thing about that is on mine i am pretty sure that the electrical wire that connect the glow plugs run to that little sensor. im just not sure on how hot my motor should be running, because I only have 1 electric fan and im 99% sure the thermostate was a 190 thremostate so shouldn't the temp be closer to that at all times?

also on top of the injection pump where the hard lines go it I noticed that it is leaking fuel around there, I tried to tight the fiting but they seemed very tight. I there a seal that is in side that can go bad? It doesnt look like its spraying out but it is wet around it.

 

Mine all (3) run at about 190 in the winter here in Florida. I did put in a 193 deg thermostat in all of them. In the summer with AC on they go to about 195-198. If yours is higher, especially with your temp sender not right in the water stream then two things to think about. First is the radiator might be too small and the second is that the fan might not be pulling enough air. That would only count around town though. On the road the fan shouldn't even come on. Any speed over about 45-50 the air flow should be enough, with a properly sized radiator, to keep the engine well within temp.

On the weeping on top of the pump. There are no seals on the hard lines themselves, they are flair fittings just like brake lines. The fittings they screw onto however do have copper seals. The bad part about that is that if you start messing with them it can warp the top of the pump and cause exactly the weeping that you are seeing. Some people have rebuilt the valves and springs in there and done it well enough to cure the leak. Others have tried and not only didn't they stop the leak but in some cases made it worse or even caused the pump to go out of time. What I was told is that there are two parts to the fitting and if the bottom part is turned it causes the final timing of the injection to get out of sync. There is an adjustment there that compensates for minor differences in the individual pump injection pulse timing to each cylinder. I always figured that if it happens to one of mine I will just get the pump rebuilt by a shop and be done with it.

 

Hey Vette , you have to get your tach from off the alternator. Doug