Oil pressure help!

Dec 5, 2006
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Well i got me a used 5.0 lsc engine and runs good, got it installed and am sure i got all wires back to where they were. When i turn the key to the on position my oil gauge rises up but then when i go to turn it over and running it drops to nothing and hits rock bottom. Took out the sender and when running oil spills out so thats a good sign.

Am i missing something , a ground wire perhaps? i'v tryed another sender and got nothing , mind you i had got this sender from another used 5.0 car out of the wreckers. Whats the next step.
 
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