I have an aftermarket tach lying around, and thought of using it just for the shift light it has in it. I was wondering exactly where to tap for the tach signal. The tach has 4 wires,
Red, Black Green, and Yellow. I know where the red and black goes to, but where does the green and yellow go. and where is tha tach signal wire? Photos would help a LOT. Thanks in adavance guys, and yes I do go every week to the strip and yes I do need the Shift Light.

 

bump...

 

Maybe this thread will help: https://www.scionlife.com/forums/viewtopic.php?t=130218

 

and this is what? I don't get it. That's why I made this post, cause I couldn't understand this.[/quote]

 

soros151 do you know where your OBD2 scanner plug under the drivers side dash is? If you pop your head under the dash you will find a little black plug... Look for a black wire on it.

or

You can pull your glovebox out and behind it will expose the factrory ECU on the right hand side. On the very top plug is the RPM wire... see the link below and where it says "I" that is the RPM wire.

http://www.zeropointindustries.net/i...em-ult-web.gif

 

At last, a very specific answer. Thanks!

 

Okay, tried looking for either the black box, or the black wire, but no luck there, so I took some pics to see if someone can pinpoint the exact location or at least a nearby place where I could find that wire. So...






Here is an upside down pic of the ECU without removing the glovebox compartment.


and can someone plase tell WTF is this?

 

The white plug in the first pic, below the fuses is the OBD 2 plug... In the pic of the ECU it is the farthest plug away or all the way to the right in it.. refer to the diagram I posted above and look for pin labled as "I"..

 

Do I have to open the OBD2 plug?

 

There are 2 clips on either side of the plug..that you can push in and it will slide out of the metal bracket that holds it.. then look for the black wire, tap into it by some means and you should be good to go..

 

Thanks.

 

No prob..let me know if you have any more questions..

 

I will.

 

hey proshop is this the same for the xb, i am in the middle or installing a shift light, and i am lookin for the wire. thanks.

 

http://trdsparks.com/install/00602-83400-005inst.pdf
pages 20-28 for the xB. The xA and tC are also listed in there in the pages prior.

 

thanks i didnt get the trd one, i got the proform one....

I finaly got it installed and it is soo nice. i just tryed all the different wires in the plug under the fues bot, and i found the one. now i can crank the music, and not have to forget to shift and over rev. But the light is sooo bright, i need to leave the cover on.

 

I got a similar one. Nice.

 

I don't have the TRD shift light either, but the tach wire listed in the TRD installation guide is the same tach wire used to attach any shift light. Can be used to attach any aftermarket shift gauge too. I used that install guide for my shift light which made it a simple job, no guessing or anything.

 

Does anybody know where to tap in to make my boost gauge's light come on with my dash lights???

 

any 12V source