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What year is the truck?
It sounds pretty strange. I'd hope a fault code is stored due to the check engine light, but if there are no codes anywhere (like for the check engine light especially) I would assume a problem with the cluster. How long after you left the dealer did this occur? How many miles on the truck?
I'd also check the oil after leaving it sit overnight, it should be in the middle of the operating range. But it seems strange to have the oil warning and check engine light come on at the same time (the low oil warning shouldn't make the check engine light come on) and also have the tach quit, all at the same time.
Gilly
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