Rep Power: 751

Ok when I go to add fuel with the Emanage, the stock ECU sees the rich signal from the O2 sensor and then pulls out fuel which makes tuning impossible. So I need something which basically intercepts the O2 sensor signal and modifys it so that the ECU won't pull fuel out under boost. Basically, it needs to be inactive under 0psi and then active above 0psi, meaning over 0psi, it will switch from sending the O2 sensor voltage to the ECU, to sending the preset voltage ( about 0.45v) to the ECU.

Does anyone know where to get what I'm looking for? I know there are probably some companies out there that make these. Flyin' Miata makes one, but it costs $100usd and I don't feel like paying that for something so simple.

Thanks.