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Hello. I'm in the process of installing a piggy back ecu on a 1994 LS400. All connections are good except for the RPM signal. I've tried connecting it to a fairly large yellow wire on the end wiring loom (NE+ I believe) and it reads rpm fine when set to 2 cyl mode but stops reading correctly...

13 second E85 naturally aspirated 1UZ build possible? Thread delete