Hi Ernest;
Just to Echo what Marv has said here, your distance will have no
effect on the MAP signal to the regulator at all. As an Instrument
Mechanic we use either a 4-20mA or a 3-15psi signal to control
processes. In the older plants it was common to see the pneumatic
signals (3-15psi) routed hundreds of feet with no signal loss.

Todd Bartrim

 And third, I now see why the regulator is located so close to the
injectors.
 'Cause that is where the reference pressure is.  If is moved further
away you kill its response.
"""

I don't think that is correct.  You're not interested in moving any
volume of air through the MAP pressure hose to the MAP sensor, just
transmitting the pressure.  A very small ID hose is all that should be
required, and its distance from the source (within reason, of course)
should not have a lot of effect.