This module was designed by MoltenCore Industries for the Toyota MR2 Spyder 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 Spyder. We have also have designed this to operated the MR2 Spyder's OEM speedocluster to have full functionality with your engine swap. Yes, this means your water temperature, oil pressure and battery lights will function just like they did from factory. We will only sell this with the purchase of our Mitch's Auto Parts wire adapter, order's placed without purchasing our adapter will be cancelled. The module is installed next to the stock ECU location and instructions with pictures are included in our download section.