LS1 Oil pressure sending unit
#2
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Autozone has them. It's an extra long 27mm socket. Maybe it's a 30. Something like that. But AZ has the OPSU sockets
#4
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Hopefully you can get some tips from this - or your engine is in a state that your intake isn't in the way!
https://ls1tech.com/forums/general-m...ding-unit.html
https://ls1tech.com/forums/general-m...ding-unit.html