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I had a their digital boost and fuel pressure gauge in the C6. They were not accurate. They had me put a bunch or extra grounding wires on them but it didn't help. I returned them and put in Autometer. They work perfect.
I used to use them and still have some old ones that work. The new ones are terrible. All the new ones I've seen are either inaccurate or segments go out. Customer service is non-existent. Stay away!
