unplug the main ribbon which usually is the longest on connected for about 10 seconds and put it back in. if you have remote start function, make sure you have the valet switch so you can program the tach (to do this: turn the car on, and within the first 5 seconds, press and hold the valet switch until your LED for your alarm or LED on the brain lights and stays lit. let go of the valet switch then turn the car off)
HTH