cleaning up engine bay harness

Ok se Im exploring the possiblities of rewiring my engine bay to suit the b20a going in. Im wondering, the current map sensor wiring comes from the passenger side. Im not useing the black box or any part therein so Id like to remove those passenger side wires from the engine bay and tuck them into the fender to forget about forever. There like 10 extra wires that go from the drivers side engine harness to the black box that I also wont be using. Is it feasable that i can use 3 wires from the black box and reuse them for the map sensor and just repin them in the ecu and call it good?

Im basically wondering if they go anywhere other than the ecu to map sensor or just from the ecu to map sensor? Ive got the cheap haynes manual and its wiring is lack and little to speak of. This sound good to the others on here?