Tracy does some magic stuff with that EC2.  With a V8 there are always
two injector firing at once.  As best I can understand it, the fuel is
squirted in sort of whenever and the engine sucks it in when it needs
it.  So for a 20B, he uses 3 signals for the injectors and one for the
staging relay which applies power to the secondaries.

Bob W.

Unfortunately, taking that approach on the 20B version lead to a back-door
circuit to the secondary through the primary, allowing about 1/2 voltage
pulses to the injectors that are turned off.  It's going to take some diodes
in the injector circuit to cut that off.  Haven't installed those yet.

Al