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It has to be the guage as you know the temp at the engine by the sensor is reading lower than the guage. The wiring must be good as generally a loose connection or bad ground will give you a higher resistance which will cause the guage to read lower not higher.
There is a test for the guage on Clarks, I would run that test and see if your guage is reading consistently higher throughout the range. If it is you can always carefully remove the needle and reset it to read correctly. Alternatively send it to a vdo service center or buy a new guage. Not much else you can do.
Personally if I knew for certain that my guage was reading consistently high and that the temp was actually ok, I would live with it.
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