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Thanks for that. Regarding the RPM spikes, I already have a 30K resistor on the mag and turning the mag off (I don’t have the standard key-type ignition switch but rather two separate toggle switches –one for each system) makes no difference to the spiking RPM so it looks like the Lightspeed...

I have an EMS D10 installed and all is working fine except for the Tacho. I have two inputs, one from a Mag and the other from the Lightspeed CDI system. Individually they each read the correct RPM and together the reading is steady and correct. During run-up, both systems read correctly. RPM...