The standard Honda MAP sensor can read boost up to 11 lbs. By using a 3 bar MAP sensor boost up to 28 lbs can be read. The same fuel and ignition tables are used for both MAP sensor to swapping between the sensors is only a matter of wiring the sensor in and using ROM Editor to change the MAP sensor type.

The 3 Bar MAP sensor

The connectors are stamped A, B & C on the sensor.

In this case an exact fit plug was not available so a GM AC Pressure switch plug was used (Conduct Tite part number 85146 from Pep Boys, about $10). We cut a small slot down the side of the connector to make it fit the MAP sensor. Hondata now supplies the correct connectors with the MAP sensors.

Splice the three wires into the existing wiring loom so that you can swap between the MAP sensors if necessary, or revert back to the stock MAP sensor.  Make sure that only one MAP sensor is connector at a time. These colors are for early model Hondas Wire Sensor Code B Series RSX-S GND A Green/White Green/White MAP signal B White Green/Red 5V C Yellow/Red Yellow/Red

For verification check inside the Honda Map sensor plug. The pins may be labeled with V O G - for Voltage, signal and ground.

Check the wire voltages with a multi-meter to make sure the wiring has been performed correctly. Especially that there is 5 Volts between connector A and C. With the ignition switch on but the engine not running the standard MAP sensor should read 2.85V between the MAP signal and GND wires.  The 3 Bar MAP sensor should read 1.6V.