For all you NA tach users...

[aphxero]

Okay so 7mge tach will work fine with 1j the difference is just frequency. You have to hook up the black wire from igniter which is IG- on the diag box and same on the tach.

So go take your tach out and on the screw hole where ig- signal enters the tach look for the first resistor once it hits the board. Should be a 30Kohm. Cut it off leaving a little of the leads. Then solder a small piece of wire in where the resistor was. I've verified against an safc2 and also dynojet and it's dead on all the way to 8krpm.

Put tach together and go rock out!



PS: this works with 2jz also.

 

[SupraMario]

Okay so 7mge tach will work fine with 1j the difference is just frequency. You have to hook up the black wire from igniter which is IG- on the diag box and same on the tach.

So go take your tach out and on the screw hole where ig- signal enters the tach look for the first resistor once it hits the board. Should be a 30Kohm. Cut it off leaving a little of the leads. Then solder a small piece of wire in where the resistor was. I've verified against an safc2 and also dynojet and it's dead on all the way to 8krpm.

Put tach together and go rock out!



PS: this works with 2jz also.

Really???
Hmm, well I already have the dakoda decoder thing from Dr. Tweak and tonight I realized that I am 10-11mph off and I dunno about RPM, I think it is fine as I idle around 550-650rpm.

 

[tlo86]

Really???
Hmm, well I already have the dakoda decoder thing from Dr. Tweak and tonight I realized that I am 10-11mph off and I dunno about RPM, I think it is fine as I idle around 550-650rpm.

you have to set it so it knows you have 6 cylinders and not 8 or it will look like you redline at like 5krpm

 

[86_sports_1jz]

nice i wished this would have came up earlier could have saved 100 bucks

 

[SupraMario]

you have to set it so it knows you have 6 cylinders and not 8 or it will look like you redline at like 5krpm

LOL yea i know I still haven't set it yet:biglaugh:

 

[87soup]

Im soo down!!!
I have a 1JZ- N/A set up and i havnt had a tach for about 9 months!!!
Im hecka intimidated to take the stock tach out though...
Can any one coach me through it or send me into a write up or something???
I really am interested in this!!!

Thanks SM!!!

 

[chuckmuska2005]

Yes, very interested on a write up! Anybody have details on this?

 

[YotaRob]

I did this and it works, there is a website about this. I will post a link when I get home. Or google 1jz tach fix and it shows up I think. Its a good article on all the tachs, na has 30k resistor 7mT has 130k I think and 1j has 100k.

 

[YotaRob]

found it on google: http://www.autosoftsys.com/supra/tachcompare/

 

[suspectsupra]

will this work with the 2jz swap....

 

[YotaRob]

It should as they both use the same igniter

 

[suspectsupra]

does anyone have pictures of this

 

[OneJSupra]

will this work with the 2jz swap....

I don't see why it won't since the 1jz and 2jz use the same igniter. How's the 2j man and when we're going to OSW? HAHAHA, yota beat me to it.

 

[suspectsupra]

I don't see why it won't since the 1jz and 2jz use the same igniter. How's the 2j man and when we're going to OSW? HAHAHA, yota beat me to it.

we should setup up something....my twins are starting to give out....single soon...

 

[ronnie4]

I did this and it works, there is a website about this. I will post a link when I get home. Or google 1jz tach fix and it shows up I think. Its a good article on all the tachs, na has 30k resistor 7mT has 130k I think and 1j has 100k.

Shouldn't we solder a 100K resistor in instead of just shorting the leads then?

 

[aphxero]

I've checked mine against my dyno and my safc and it's right on. If you're a little off maybe you could use a 100k pot to tune it? It seems the other resistors and things don't have much of an effect on the readout (if any).

Try it out I'm sure it'll work out fine Even if some of us end up being 5-10 rpm off who cares. Tach isn't life and death right? I don't know about you guys but I don't look at it a whole lot. Funyy how it's super annoying when it doesn't work haha.

 

[ronnie4]

I've checked mine against my dyno and my safc and it's right on. If you're a little off maybe you could use a 100k pot to tune it? It seems the other resistors and things don't have much of an effect on the readout (if any).

Try it out I'm sure it'll work out fine Even if some of us end up being 5-10 rpm off who cares. Tach isn't life and death right? I don't know about you guys but I don't look at it a whole lot. Funyy how it's super annoying when it doesn't work haha.

Thanks for your help, will probably do this mod this weekend.

 

[ronnie4]

Which resistor on the picture below did you cut? R1?

Also where did you get the ign- from? Straight from the igniter?

Thanks

 

[terror]

where exactly is this ig- wire at, i cant seen to find it a picture would be great

 

[aphxero]

That would be r4. The one directly connected to the signal input.

And yes ig- from igniter.