Tachometer Illumination - Toyota Yaris Forums

Thirty-Nine · 05-29-2009, 02:54 PM

So, I've searched and found a few threads regarding aftermarket tachometer illumination. I've wired up my Autometer Autogage tach, and now need to illuminate it.

I saw that you can use an add-a-fuse in slot #23 as shown here (I have the mini add-a-fuse, but it's only rated to 10 amps):
http://www.yarisworld.com/forums/sho...r+illumination

... and I've heard of people tapping into the stereo dimmer wire.

Can anyone give me a definite answer as to how to illuminate this tach? Is one way better than another?

Tamago · 05-29-2009, 03:28 PM

hopefully one bulb won't pull more than 10 amps :D i say add-a-fuse

CTScott · 05-29-2009, 03:49 PM

The output of the light control rheostat (connector D29) controls the radio illumination, AT shift lever illumination, and AC control illumination.

You can tap into the green wire in pin 2 for the negative side of the illumination circuit and any +12V source as your positive (such as the light blue wire in Pin 10). Pin 2 varies from 0 Volts (full brightness) to 12 Volts (fully dimmed). This will allow the tach to dim with the rest of the controls.

Thirty-Nine · 05-29-2009, 04:38 PM

Quote:

Originally Posted by Tamago

hopefully one bulb won't pull more than 10 amps :D i say add-a-fuse

So, I did the add-a-fuse thing using fuse #9 and the tach illuminates ... but it stays on even if the car isn't on ... Can I just use any other 10am fuse spot? Can I use any open port with the add-a-fuse?

Thirty-Nine · 05-29-2009, 04:59 PM

I put the add-a-fuse in slot #7 and it all works fine. Woo hoo. Now let's hope my wiring job holds up.

05-29-2009, 02:54 PM	#1
Thirty-Nine Small cars are a big deal View User's Garage Drives: 2007 Yaris Liftback Join Date: Feb 2006 Location: Portland, OR Posts: 3,144	Tachometer Illumination So, I've searched and found a few threads regarding aftermarket tachometer illumination. I've wired up my Autometer Autogage tach, and now need to illuminate it. I saw that you can use an add-a-fuse in slot #23 as shown here (I have the mini add-a-fuse, but it's only rated to 10 amps): http://www.yarisworld.com/forums/sho...r+illumination ... and I've heard of people tapping into the stereo dimmer wire. Can anyone give me a definite answer as to how to illuminate this tach? Is one way better than another? __________________ Subcompact Culture: The Small car blog

05-29-2009, 04:59 PM	#5
Thirty-Nine Small cars are a big deal View User's Garage Drives: 2007 Yaris Liftback Join Date: Feb 2006 Location: Portland, OR Posts: 3,144	I put the add-a-fuse in slot #7 and it all works fine. Woo hoo. Now let's hope my wiring job holds up. __________________ Subcompact Culture: The Small car blog

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05-29-2009, 03:49 PM	#3
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	The output of the light control rheostat (connector D29) controls the radio illumination, AT shift lever illumination, and AC control illumination. You can tap into the green wire in pin 2 for the negative side of the illumination circuit and any +12V source as your positive (such as the light blue wire in Pin 10). Pin 2 varies from 0 Volts (full brightness) to 12 Volts (fully dimmed). This will allow the tach to dim with the rest of the controls.