hi, im not too good at electrical stuff, but i was able to splice into the tach wire of my old car to get this shift light to work just fine (+ power and ground).

So i just need to know where the RPM / tach wire is in a 04 STi. If anyone can help me find this i would be very happy, my searching hasnt found much help.

pics would be awesome too if anyone has some! thanks in advance!

THere should be a green wire coming off the tachometer harnesss.

THere should be a green wire coming off the tachometer harnesss.

im sorry i am very inexperienced with the wiring in this car. Where can i access the tach harness / which one is it?

You'll need to pull the gauge cluster(tach/speedo/etc) out. Remove the paneling surrounding that, a few screws. A few more that hold the cluster in place I believe. On the back of the cluster is three harness plugs. One that is behind the tach, another behind the speedo, another behind fuel/temp. The harness behind the tach, and the solid green wire. I believe.

You'll need to pull the gauge cluster(tach/speedo/etc) out. Remove the paneling surrounding that, a few screws. A few more that hold the cluster in place I believe. On the back of the cluster is three harness plugs. One that is behind the tach, another behind the speedo, another behind fuel/temp. The harness behind the tach, and the solid green wire. I believe.

alright cool. i can handle that, ill just splice into the green tach wire. as far as power though, is there an acessory terminal on the fuse block, or should i wire that into something else?