Aq 2D pump in the trunk. Where to mount the pressure sensor?

[mx5]

Actually the wiring is not a problem - two instead of just one wire going from the trunk to front is not that much different.

What would be cool if I mount the manifold/pressure sensor near the pump in the trunk is that I will have a short water line there which I can disconnect easy to prime the pump.

What I am afrad is - is it possible to have a pressure drop from the manifold/pressure sensor near the pump to the HSV which will be 6-7 feet of tubing away - in the engine bay - and this way the pressure sensor not reading the real water pressure at the HSV? How do you think opening the HSV changes the water pressure in the tubing near it and 6 feet back at the water pump?