This emulator has been designed to maintain a constant (adjustable) voltage from the petrol pressure sensor when running on LPG. It is intended for use on vehicles that detect unexpected rail pressure and switch on the check engine light. It will work with most petrol pressure sensors that have 3 or 4 wires and operate at 2 to 3.5 volts. Previously called AEB 90710100.
Fitting instructions can be found here.