ive posted before about this.new sending unit,gauge moves when key is turned on.wondering,can i just rig up a wire from sending unit to gauge directly and see if wire is problem

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95 e320,87 sdl,79 300sd

Yes you got 3 pins on the sending unit connector. Jump them all 3 ways should show.full, empty.them resvere light on. You can hurt nothing doing this.good luck.

Using those instructions to troubleshoot a temp gauge is going to require more than luck!!!

my sending unit from block has one connector goes throught the glow plug relay box to gauge.

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95 e320,87 sdl,79 300sd

Unplug the sensor on the engine. If the gauge moves you may have a bad or shorted sending unit. If not, and the sensor is unplugged, you have a wire problem.

so in looking down at engine,there appear to be 2 sending units one near injector1 and one between injector 2 and 3 which one is water temp?

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95 e320,87 sdl,79 300sd

I don't know, but what the heck, just unplug them both. If the temp gauge does not move, plug them back in one at a time until you find the sensor that makes the gauge move, and you've found your 'bad' sensor.

If the gauge does still move, you may have a wiring problem.

following up,initially wheni replaced temp sensor i made a mistake and replaced the boost pressure sensor,looks like the temp sender and is only a few inches laterally.so now with reversed wires gauge works.ill have to take both temp and boost sensors out and reverse their location.crazy

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95 e320,87 sdl,79 300sd

Still, problem solved and a Happy Ending!