Is there a tach hook up problem like the sr??

Post by **NisWerks240** » Sat Oct 05, 2002 5:03 am

well is there?? i was thinkin to use my monster tach instead of gettin a 91 up factory cluster

Post by **Daunttless** » Sat Oct 05, 2002 5:03 am

Post by **CA18 RS13** » Sat Oct 05, 2002 5:03 am

my stock tach doesnt even move when hooked up. you're gonna have to get an aftermarket one.

Post by **NisWerks240** » Sat Oct 05, 2002 5:03 am

yeh i know mike, its like the sr guys, the tach on the 89-90 240sx is not caliberated right for the sr and ca, plus the ka24de. ppl swap the cluster or just the tacxh from a 91 up, i just wanna run the tach signal to my monster tach i hve layin around and use that instead, since it had a 10k redline , plenty to show off th revs of my futre ca

,, my question is how can i wire up the tach so i works?? can i find the tach signal on the harness goin to the cluster??

Post by **Yht988_180sx** » Sat Oct 05, 2002 5:03 am

I had the same problem with my tach when I first swapped out the ka24e for the ca18det. I'm currently using a 92 ka24de gauge cluster. The tach works, but I still can't figure out why the speedo doesn't work. I don't know if it's the speed sensor on the transmission that's messed up or if it's the gauge cluster. If anyone knows the solution to this please hook me up. Thanks guys....

Post by **Daunttless** » Sat Oct 05, 2002 5:03 am

Did you switch to the KA's speed sensor on the transmission? If you didn't its trying to do KMPH on your MPH speedo. : )

Post by **Yht988_180sx** » Sat Oct 05, 2002 5:03 am

No i haven't switch to the ka speed sensor. I going to give that a try today.

A problem is I'm in Canada though, and all the cars here use km/h. My speedo does have km/h and mph, but I don't know if the speed sensor gives a km/h signal or mph signal to the gauge cluster. Thanks

Post by **1991240xs** » Sat Oct 05, 2002 5:03 am

I could be wrong but I thought that the km/h and mp/h sensor sent the same signal..just used a different dash overlay?

Post by **CA18 RS13** » Sat Oct 05, 2002 5:03 am

the tach wire is green with a yellow strip if i remember correctly. just cut the wire before it hits the instrument panel and run it to your autometer one instead. i just used the dead area as a space to put my AVC-R.my ghetto setup:

Post by **Goodbar6** » Sat Oct 05, 2002 5:03 am

Thats a nice looking setup ya have there CA18 RS13. Tyler

Post by **Movingviolation240** » Sat Oct 05, 2002 5:03 am

the KPH and MPH speedo's use the same 'number spacing' and I have the KPH speed sensor in my gearbox and the speedo reads fine. I think the electronics are all the same, the only difference is the actual gauge face and what it shows on the scale.

PaulOrlando, FL

Post by **Spectre23** » Sat Oct 05, 2002 5:03 am

OK, sorry to dig up an old topic, but can I just use the tach from my front clip? Is there anything special required in doing that?

Post by **USsil80** » Sat Oct 05, 2002 5:03 am

no i just put the jdm one in my car..just unplug and plug

Post by **float_6969** » Sat Oct 05, 2002 5:03 am

Leave it to spectre to dig up a 2 yr old thread, but ya know what, IT MEANS YOU'RE USING THE SEARCH BUTTON!!! And for that, you get a cookie...But in answer to your question that is kinda what I did. So here is the deal. I have a 90' and it had the old tach, which won't work with the CA/SR signals. But I wanted to keep my 115mph speedo, but I also wanted the 9G tach, so this is what I did. First of all I switched the speed sensors in the transmission. THEY AREN'T THE SAME AND DON'T SEND THE SAME SIGNAL!!! One has fewer teeth in it than the other. If you want to use the JDM gauge cluster then leave the sensor that came with it in, if you want it to read in MPH and keep your gauge cluster, then you'll need to swap sensors. Now, to get mph and a 9G tach you will need to take the tach out of the JDM cluster and swap it into the USDM gauge cluster. The hardest part is getting to it, but once you get it out you'll unclip the clear plastic cover, and then the black gauge cover. Now you can see all the innards of the cluster. Now flip it over and on the back is 4 (I think) screws that hold the tach in. Unscrew them and the tach should come right out. Do the same thing to the USDM cluster and then screw the JDM cluster into the place that the USDM tach was in. You now have a cluster that reads in MPH and has a 9 thousand rpm tach. Contratulations!

Post by **diamondstar36** » Sat Oct 05, 2002 5:03 am

Hmm.. this is interesting. I have a 90, but it's a late model with a DOHC KA. So my cluster should work correct?

Post by **Nismo1182** » Sat Oct 05, 2002 5:03 am

They ARE the same speed sensors. I left my CA speed sensor on the transmission, and when ever I cross one of those digital speed radars cops put on the road the speed is dead on with the gauges.

I also used a SR tach.

Post by **Spectre23** » Sat Oct 05, 2002 5:03 am

I don't remember my front clip tach being higher number than my 240. I remember the redline was like 7000 or so even though I remember reading the CA revs to 8500 stock.

Oh man, if you guys saw the wiring some guy did to this car you would cry. I still need to figure out what happened to the manual window crank gear. Aftermarket power windows = big time bad news.

Post by **ca18det_boy** » Sat Oct 05, 2002 5:03 am

Why did it take two years to reply to your own thread?

Post by **Nismo1182** » Sat Oct 05, 2002 5:03 am

8500 stock? nope.

My SR tach reads 7500 redline and thats what I take me CA too once in a while.

Post by **float_6969** » Sat Oct 05, 2002 5:03 am

Well I still disagree about the speedo being right, but I haven't actually shot radar on the 2 to see if there is a difference, so I suppose that they could be the same. but I could swear they had a different # of teeth, which would lead me to believe that they wouldn't read correctly on the USDM speedo.

Post by **Nismo1182** » Sat Oct 05, 2002 5:03 am

the radar signs are right and ive had cops pace me before, no problems.

Post by **kazuo** » Sat Oct 05, 2002 5:03 am

I had a SR20DET motor.

I had a KA24E motor.

I had a JDM CA18DET Digital Cluster, a KA24E Digital Cluster, and a KA24DE Digital Cluster.

The CA18DET tach and the KA24E tach worked on my KA24E motor. The KA24DE did not.

The CA18DET tach and the KA24E tach did NOT work on the SR20DET.

So, either you are all confused (cus CA tachs dont work on a SR. I would assume the reverse is true) or the CA18 has some sort of magic trick it does to make it work.

IIRC CA18DET and KA24E share the same tachometer signal. People with 89-90 240SX should not have to swap tachs. If you do you must have wired it up incorrectly.

The speed sensors are NOT the same. You must swap them or the speedometer will be off by a few MPH. The signal is the same so you will get a reading, but it will be inaccurate.

If someone can provide information to the contrary, it would be helpful (I'm going to help someone with a CA swap eventually and I'd like to anticipate any issues beforehand).

Thanks

Post by **Nismo1182** » Sat Oct 05, 2002 5:03 am

My car is a 90, I swap the CA in and before I put in a SR tach, my KA24E tach didnt read the CA rpms. I wired everything perfect so I know it wasnt a wiring fault. Once I put the SR tach in, RPM's worked. It cant just work one way and not work another.

Post by **NeedCAforS13** » Sat Oct 05, 2002 5:03 am

kazuo wrote:I had a SR20DET motor.

I had a KA24E motor.

I had a JDM CA18DET Digital Cluster, a KA24E Digital Cluster, and a KA24DE Digital Cluster.

The CA18DET tach and the KA24E tach worked on my KA24E motor. The KA24DE did not.

The CA18DET tach and the KA24E tach did NOT work on the SR20DET.

So, either you are all confused (cus CA tachs dont work on a SR. I would assume the reverse is true) or the CA18 has some sort of magic trick it does to make it work.

IIRC CA18DET and KA24E share the same tachometer signal. People with 89-90 240SX should not have to swap tachs. If you do you must have wired it up incorrectly.

umm, nope. All twin cam tachs work off the same signal (16bit IIRC) I'm 100% sure of it:) so I'm guessing you were confused about what tach you were using where. I have used both a CA18DET JDM cluster and the USDM KA24DE cluster on my CA. Worked fine...

The KA24E cars with swapped CA's around Orlando did not have working tachs until they put DE/JDM tachs in (Nismo1182 is running a JDM SR tach and it worksfine). I have no idea what you were doing, but your information is wrong (about the tachs at least, your speedo info is correct:))

and yes CA tachs work on SR's. which again leads me to believe you didn't have a CA18DET tach.

Sean

Post by **float_6969** » Sat Oct 05, 2002 5:03 am

And we had to re-revive a year and a half old thread...

Post by **kazuo** » Sat Oct 05, 2002 5:03 am

NeedCAforS13 wrote:and yes CA tachs work on SR's. which again leads me to believe you didn't have a CA18DET tach.

Well, my friend ripped the cluster off himself from a CA18DET powered S13 Silvia, and it didnt work on my SR20DET, so I don't know what to tell you.

This is very interesting though...

Hmm, any CA owners want to buy a ARC Sidemount from me? I ended up getting one for a CA18 and I'm too lazy to make it work with a SR20... :P

Post by **NeedCAforS13** » Sat Oct 05, 2002 5:03 am

thats so weird

"rico" or something like that was looking for an ARC sidemount last week. I'm sure he will be VERY interested:)

Sean

Post by **NeedCAforS13** » Sat Oct 05, 2002 5:03 am

here's the thread:

http://www.nicoclub.com/forums...51206

Sean

Post by **Nismo1182** » Sat Oct 05, 2002 5:03 am

Whats the dimensions on that ARC sidemount?

Is there a tach hook up problem like the sr??

Is there a tach hook up problem like the sr??

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