Thanks Ragged, That's where I re-installed it inline with the original sensor. So they are both still there. I tested it again but still no pressure with just a water hose, I'll see if it works in the water.

Tomorrow if it doesn't rain I will be installing the oil temp sending units. I will remove the remote oil filter bracket base and filter, drill and tap an 1/8" hole in the bottom area of the gap between the outside sealing edge and the center thread flange. Install the sender below the oil filter.

VV,

Are you trying to measure the water pressure of the closed cooling circuit or the raw water flow? My vote would be raw water as you can tell if you have cooler/exchanger blockage or a spent impellar before things heat up. This is more likely then a closed system leak.

You won't see much raw water pressure until the boat is moving in the water. As I recall, I needed to be about 5 to 10 MPH for it to register. There's less flow resistance in your heat exchanger set up (then a raw water cooled set up) so you may need to go a little faster to register.

I first hooked it up on the closed cooling system, then slapped myself and said, "Why did I do that", I needed to have a reading on the raw water so like you said, before things there heat up and tell if the impeller is wearing out. Now I can relax and have a V-8 juice.

I got the remote oil bracket off and took them to the machine shop to get the 1/8" hole drilled and tapped for the oil temp sender. Hope he doesn't screw it up.