I'm currently converting my 1992 Legacy EJ22 to LPG and I have a problem to get an engine speed signal. the wiring diagram for the LPG control unit tells me to connect the corresponding wire to ignition coil minus or to another signal with min. 4 Vpp (peakt-to-peak voltage). Since there's no minus at the ignition coil, I took the minus at the igniter. But I don't get a proper signal there.
Has anyone an idea, where to connect that wire? Thanks!