FAST E6 Digital Ignition TesterThe tester simply plugs inline on the 6 pin Weatherpak connector of most E6 ignitions and is supplied with a load test plug that you install on the coil wire at the distributor cap. With the ignition on, you can simulate a trigger signal that fires the ignition and coil. From there you can compare the tester? s accurate digital readout with the tachometer and also test the function of any RPM activated switch such as for a nitrous solenoid or shifter.