Hi Charles. I have a similar problem in my Celica (RA63 with 18R-G engine). My Wolf ECU has a 12 v square signal output that doesnīt make the tacho work at all. As Iīm running wasted spark in my car, I have 2 options: adapt the square signal from the ECU output to my tacho input or "join" the signal of both coils and send them to my tacho. A friend of mine, who deals with electronics recommended the last option as being better (in the first option, in case you donīt have the tacho connected, the circuit would fry).
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