Instructions were very good. The readings that I was able to measure with another device are within the range of accuracy. The temperature sensor is slightly different from the engine sensor. The thread on one of the sensor lugs for the housing was not completely drilled out. I had to cut the thread properly so the sensor would sit flush. Also you can dim them but still be nice and bright. They need to sell a kit that removes about 25% of the light output. Looks really good on the dashboard (that's why I updated it from 3 to 4 along with instructions and support telling me what I need to do to fix the sensor).
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