I have Defi link gauges and a SAFC. Of course they both need a tach signal, but when I share the tach signal from the ecu wire (about 4" from the ECU plug) i get a CAS code and the car starts to run on 3 cylinders. But if I tap into that tach signal with only the SAFC I get a reading on my screen and the car runs fine. Can I not tap 2 signal wires into the ecu harness? Anyway around this? Maybe gap them much further apart? Any thoughts would be appriciated. Thanks!