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I went glowshift because when I bought them, I was hard for money and needed something to watch the vitals on my truck. I think they match the gauges very well, and are pretty easy to read. Accuracy is not something I can comment on, but I feel that they are consistent enough to know where "normal" is and if it is above or below normal, I should look into it. They serve the purpose I have for them, and none have failed yet (3 years later) so I guess they are doing ok in my book.
Same here and what Jarrett said. I have used them in three trucks now and would continue to do so. The only issue I had was the sensor on the Oil Pressure gauge, and they have since updated that from a diaphragm type to an electrical one. No problems in the year since doing so.