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I am new here on subie forums... I,ve got problem with installing "piggyback" computer to my subaru rx leone turbo 1987.. It has 4 plug ecu cable, and the problem i,ve got is that i dont know where i can get the tach/rpm signal for my piggyback. It need tach/rpm signal for working. So does the 4 plugs what goes to ecu have this tach/rpm signal wire? And if it does what wire is it ?

- Greetings Virta

Couldn't you just take it from the coil. I declare i forget which side of the coil is tacho - er neg ?

Are you using a wiring diagram to wire up the piggyback?

The factory ECU will get a RPM sense from the engine but you'll need to check against the wiring diagram.

Hello!

Yes, i am using a wiring diagram, and i forgot to reply that i found the wire, wich leads to tach..

Greetings Virta