He said it was running good, but I know my brother-in-law, he's clueless. He didn't know even that the warnings lights in the clock display was not working. only the door ajar was working. I replace the clock unit and the Daytime running light Mod. because that was not working even thouhgt he said it was.. He is cluessless when it comes to cars. what should the reading be with a vaccum gauge?