Youll need a 1/8npt to 3/8bsp adapter. Since chances are your not gonna find a 3/8 bsp adapter, just use a 1/8npt to 3/8npt adapter(people will tell you 3/8npt is wrong, BUT TRUST ME, the fit is tight because of the wrong thread pitch but its works 100% no leaks, have done it plenty times) Make sure to use a little thread sealant. You can put in place of the bvsv valve thats on the thermostat housing(Has 2 vacum lines running to it). Obviously. the charcoal canister would operate properly then, but you can just get rid of it. Also if you dont have a/c you can remove wither the a/c fan switch or aux fan switch and put the 3/8 to 1/8 adapter in its place.
Here is what it would look like if you installed the sender and 1/8 to 3/8 adapter on the thermostat housing(look next to the green plug) :
(btw my thermostat housing was a jdm which is why it has 2 ports instead of 3.)
and here is a diagram of the water outlet housing and thermostat housing: