gauge fittings
I think the water is either a 12 or 14 mm by 1.5 pitch. Each head has a water port, passenger side it to the rear. Not sure on the oil pressure port.
It has adapters that fit both the oil port at the rear of the intake and water port on the aft side of the passenger head. I think the temp gauge needs to be electronic because the mechanical style ones are to big for the adapter and port. I have read that here in another post. I used this kit to install autometer gauge set to the ls1.
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On the water temp, you can buy one of these Flex a Lite radiator hose adapters and grab your steam line location and temp sender location in one shot.




