Im trying to get my factory Nissan tach to work and it works the same way as an LS1 tach. signal. The factory LS1 runs off of a "4 cylinder" 4 pulse per revolution signal and the factory nissan tach runs the same way only its a 6 cylinder so it runs off of a 3ppr signal. I know theres a way to get the 24x crankshaft position sensor to read 3ppm if its able to be divided by 8 some how.(Hinson supercars sent me a failed attempt at one of these and the instructions were to hook up a wire to the cps then into my nissan ecu and the unit used a power/ground to power it)

...Does anyone in here have the electronic ability to make a unit that would be able to read the cps/8 to give me the correct ppr to get my tach to work? Ive contacted MSD and a few other places with no luck.

 

Dont change anything related to the crank sensor circuit. The PCM is either set for 24x or 58x and is not adjustable in any way. If a 24x PCM does not receive a 24x signal, your engine will not run at all

However, your tach output value IS adjustable, talk to your tuner

 

what PCM are you using? You should be able to set up the tach output to whatever you want with EFI Live. We are a dealer if you are interested in purchasing it.

 

I am my tuner. And im using HP tuners. I tried to set it up as a V6 tach and it didn't work.

 

Does anyone know the voltage the tach signal puts out? Maybe that will help. The nissan signal puts out .1-.4v signal and I have to hook it into the #1 coil wire that goes into the nissan ecu to be translated by the CAN network and sent to the tach.

 

Try the booster wire if your output is correct but the tach still doesnt move

 

Booster wire?

 

You might PM CalEditor. He's pretty damned knowledgable, and might be able to help you out. He's in the middle of "scaling" my PCM's fuel gauge output for me, so I can use an '02 PCM to feed the fuel guage in my '98 cluster...a HUGE pain....and definitely NOT a regular "segment swap" to make it work. He's been great to deal with. He probably won't ask you for any $$$, but I'd strongly suggest that you make a donation to his cause in the form of $$$....there are not many people out there that are willing to tackle this kind of stuff.

Just my $.02

 

http://www.lt1swap.com/lsx_tach.htm

You need to bookmark and read over that guy's whole site before you start messing with wiring

 

Ive already wired up the whole car. Everything except the factory Nissan tach works. The Tach doens't get a tradition signal like most other tachs. The signal is sent to a control module then converted into a digital code which is then sent to the gauge.

This is from the FSM



I have to somehow figure out how to get a signal and attach it to the #1 ignition wire and thats how someone is the past has gotten it to work. However trying to get a hold of him has proved completely useless.

 

It seems like if I can get the LS coil signal 5v signal to match what the nissan ECU is looking for that it would work....

 

Snyper,

Did you ever get this figured out and get your tach working? I am in the same dilema now with my G. Any help you can offer would be greatly appreciated.