View Full Version : Tach Install! Help me out Fast!

09-30-2003, 07:41 AM
Hey, i know this isnt the right forum but it is the most busy. Well, i am trying to install a Autometer tach. Its just a regular old black faced tach w/ no shift lite. Anywayz we are having trouble finding the wires to tap into. We called a local shop and they told us we have to send the tach to Autometer for some connection that works w/ the SI and RSX. I know its not tru since i have seen many people on this site hook up tachs. Can u guys please help me out w/ this wiring? thanx...chris.

09-30-2003, 07:51 AM

I swore I just saw a post about something similar and it had the
wiring diagram in it...but I can't find it for the life of me. Still

EDIT: Here (http://www.k-series.com/tech_detail.php?Tech_ID=RAZO_SHIFT_LIGHT) you go. HTH...

09-30-2003, 07:58 AM
is this the same for a Tach. I am not installing a shift lite.:confused:

09-30-2003, 08:36 AM
Both a shift light and a tach need an RPM signal, correct? I'm
thinking they both use the same wire.

09-30-2003, 08:39 AM
i dont know, i have never done this. I heard the SI and RSX have a blue wire near the fusebox that is directly for the RPM Signal. I however have no idea where this is..lol.

09-30-2003, 08:49 AM
Yeah you can tap into it as its going into the ECU which is located behind the glove box. The wire you want to tap into is the the blue rpm signal wire. It should be on the bottome row, 6th pin from the right on the far right block. This depends on your orientation of course.

09-30-2003, 08:54 AM
awesome thanx! I will try it when i get home. The Tach i have is black faced w/ NO ShiftLite. It only has 4 wires on the back. thanx alot i appreciate it!

09-30-2003, 08:56 AM
Can u tap into it from under the hood? Thats what all my friends were looking for...?

09-30-2003, 09:10 AM
You can, but why bother? You'd have to snake the line through the firewall and find the rpm sensor on the tranny. Its really easy to route wires behind our dash . You can almost stick your whole arm behind the middle lower portion of our dash. Post pics when your done, also where are you mounting it?

09-30-2003, 01:25 PM
Originally posted by Chrisbgft
Can u tap into it from under the hood? Thats what all my friends were looking for...?
hey, I have a howto for a shift light, basically same thing:

For the power wire. Take the red wire and splice it into the green/black wire with silver dots. This wire can be found above your dead pedal. It's hot, so once you turn the key on, you have power.

For the rpm wire...splice it into the blue wire on the far left ecu connector.

09-30-2003, 01:29 PM
and a pic

09-30-2003, 02:04 PM

09-30-2003, 02:05 PM
Nice, thats even better..thanx alot..i appreciate it!