I'm wiring in a new to me EVO4. Trying to determine which wire to use for RPM? I already found the tach signal wire in the Miata harness. But which wire do I use from the AIM pigtail? The Blue says 5-50v and the White says 150-400v. Both seem to work. Which is the correct one though?
Interesting to note that they both seem to display the same incorrect RPM at idle (~2500ish) but I'm thinking that might be a config that I need to fix.