there is no tach or cranking signal to the computer is the some kind of adapter i can get to make the coil tell the computer that it is cranking over to fire the fuel injectors. can anyone help thanks for everything

 

any ideas

 

The stock RX-7 ECU's have a wire that leads to the crank circuit to tell the ECU when your trying to start the engine.It also kicks on the fuel pump circuit opening relay.You can wire it to the starter solenoid or the ignition switch.On all FC's its a black/white wire............what ECU are you running?

Also,the stock ECU's need to see a trailing coil signal, to fire the injectors.The tachometer also reads off the trailing coil signal.