DIY: TACH INSTALLATION INSTRUCTIONS

[jrsyaris]

i would like to put the instrument cluster w/ tach, in a us spec, 2007 hatch back.
will the cluster physically fit, and how much of the wiring to the cluster would
have to be re done? has any body tried this before? thanks for any help in this
area. bob smith, ohio

[CTScott]

Originally Posted by jrsyaris

i would like to put the instrument cluster w/ tach, in a us spec, 2007 hatch back.
will the cluster physically fit, and how much of the wiring to the cluster would
have to be re done? has any body tried this before? thanks for any help in this
area. bob smith, ohio

It is plug and play, as long as you purchase one from a comparably equipped car (i.e. if you have ABS it has ABS, if you don't it shouldn't). There are many threads on here about people having done so, or desperately searching for one to do so. The hardest part is finding one, since so few Yaris in the US have had them.

[dumb0]

hey guys! i just installed my tachometer yesterday!
special thanks to mr. CTSCOTT for the wiring suggestions!

will post pic soon. orayt!

next stop, suspensions! :))

[Ron Powley]

Tach is important to me. Hearing aids, and excess road noise make it impossible to hear the little hum of the engine.

[Brianr4]

Just installed my tach and wanted to compare RPM's to make sure it is accurate.
2008 3dr, 5 sp manual.

Turning 3000 at 70 mph.
2500 at about 60.

[RedRide]

That sounds right
Mine reads about 2800 @ 65mph in 5th

Yours is callibrated/configured properly for a 4 cylinder.

[BIGTAZ351]

Brainr4
There isn't much diff between the Auto and 5 speed, (I imagine thats why the epa guesses we'll get nearly the same) I'm running about the same "R's" with my auto...a drop to 3rd puts me at 4300+/- @ 70.

[Brianr4]

Thanks!
I didn't think I would be turning so much at 70mph.
If we had a 6 speed gas mileage would be close to the Prius.
Ha, I guess that is why they would never put a 6sp in the Yaris!

[Who_Is_SB]

Just installed my tach, 3 3/4" Glowshift Elite 10 Colour. Behind the steering wheel with full access to the glovebox behind it c:


[Taken with Nikon D3000 w/ 10.5mm Fisheye]

[Betrivent]

Followed this DIY, works fine. You can actually use any of the "top" row of the OBDII connector for ground.

[KSIbucky]

The factory ground is better. Why tap into a wire thats a foot away from a ground point? The factory ground is exactly that a ground its not a obdii point it has a purpose use it.

[RedRide]

Originally Posted by KSIbucky

The factory ground is better. Why tap into a wire thats a foot away from a ground point? The factory ground is exactly that a ground its not a obdii point it has a purpose use it.

Not really, If something has a positive ground and can more than handel the current load imposed on it, that is all that is required or ever needed

A tach is a very low current draw item and the OBD2 ground is more than adequate.

Don't loose site of the fact that if you are getting the tach signal frome the OBD2 to begin with, it will also be good for the ground. All modern tachs use LED/low current lighting.
Otherwise, it would be like runninng a perfectly adequate 24ga wire for an item's positve and then, runing an 8ga wire for the ground for example. There would be simply no need for a 8ga ground.

[KSIbucky]

why would you though when there's a body ground right there

[RedRide]

Right where?

[KSIbucky]

There's ground right by your left foot. read the diy. why would you want to ground to a obd2 rather than a factory ground point

[RedRide]

Originally Posted by KSIbucky

There's ground right by your left foot. read the diy. why would you want to ground to a obd2 rather than a factory ground point

Yeah, behind the left kick panel (by your left foot) is where I grounded mine.
I did that out habit more or less as most all Toyotas have factory ground pont there.
However, the OBD2 is closser so why not use it?

[CueBall]

I installed my tach today. The light works, but the tach doesn't.
I know I have power and ground because I can test those with my test-lite.
Is there any way to test the tach signal circut?
I am useing the tan wire furthest to the left on the OBD connector, as shown in this thread.

I get no lite with a test light on that wire, but my volt meter reads about 6.8v.

[Lil Abner]

Originally Posted by CueBall

I installed my tach today. The light works, but the tach doesn't.
I know I have power and ground because I can test those with my test-lite.
Is there any way to test the tach signal circut?
I am useing the tan wire furthest to the left on the OBD connector, as shown in this thread.

I get no lite with a test light on that wire, but my volt meter reads about 6.8v.

Well, the tach signal needs a solid ground in order to work. That being said, are you sure you don't have your positive and negative wires flipped? Also, HOW did you tap into the tach signal wire? Did you use a BLUE t-tap or scotch lock?