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Re: Lets get this LS 5.3 running!
Most harnesses delete the oil pressure switch. So don't worry about that one. That single tab should be fine for the map sensor but like biketopia said you can plug it into another vacuum hose (its what I did).
Side note, replace all your sensors while you have it apart. Its cheap insurance. I just spent two days with an no start issue because of a bad crank position sensor that didnt throw a code right away.
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