This module was designed by MoltenCore Industries to operate the Toyota AC system without the use of the Toyota OEM ECU for K20 and K24 swaps. Previously, the Toyota OEM ECU was the only computer available to operate the A/C system. This meant that with any engine swap that had working A/C you also had to have a Toyota ECU either running primary or secondary. With this new module that is no longer required. This module will allow you to have a Toyota A/C compressor working in your MR2 with ANY engine you put in it, including other manufacturer's. This module allows for a completely stand alone A/C system. We have also updated some features that were not available on the OEM system. Available with a plugged harness or solid wires. This is not a plug and play module unless it is installed with the Mitch's Auto Parts wire adapter. The module is installed behind the speedometer and instructions with pictures are included with purchase.