It honestly depends on the generation your engine came out of.
OBD0 Honda's had the map on the firewall, which is where your SI harness is trying to reach. OBD1 Honda's have them built onto the top of the throttle body, in that case, you need to add about a foot of wire to your map sensor connector, and then it will reach and connect without issues.
If you add wire, I strongly recommend solder/heatshrink, or non-insulated butt connector, a good pair of crimpers, and heatshrink. Also, purchase some more loom to keep that -- Fresh from the factory -- look =)
Let me know if I can help out anymore bro. That's what we are here for
Dave