So, I’m kinda new to this, I had my 1994 pretty stock for a while and wanted to change, my stock ECU got fried and I bought a speedyefi, got it to turn on and stuff, just purchased a wide band o2 (AEM 30-0300) and installed it, I put the 0.5v positive to the blue wire on the stock o2 connector.


Blue wire on o2 sensor connector


But now the wideband and tunerstudio don’t read the same, I changed the ground to the one below the brake booster (Driver side) and still nothing, I’m not really sure if it could be the 12v source, I used the cigarette lighter in order not to mess with ignition stuff. I put the right calibration that came with the AEM manual, but it’s still the same, goes up and down in tunerstudio.