no tach signal?

[burninskulls0911]

i installed an autometer tach and when i turn the car on the tach comes on and i can adjust the shift light but when i start the car it doesnt show rpms

i have the wires red-ignition ****ched 12vblack-groundgreen-tach signal-ecu pin #7and white for the light

i dont understand why im not seeing any tach signal

[Darius]

Are you sure it is getting power? Does the light or gauge face light up upon startup? Also, have you adjusted the tach to read a 6-cyl signal?

[burninskulls0911]

Are you sure it is getting power? Does the light or gauge face light up upon startup? Also, have you adjusted the tach to read a 6-cyl signal?

yes its getting power and yes it is set for a 6 cyl

when i turn it on the needle jumps to whereever i have the light adjusted to and when i turn the shift light adjustment knob it moves

[HxC_Nismo]

check your signal wire connections and make sure its wired up to the proper tach signal. if it seems to be all correct you probably have a defective tach.

[burninskulls0911]

check your signal wire connections and make sure its wired up to the proper tach signal. if it seems to be all correct you probably have a defective tach.

im sure the wiring is right this is the 2nd tach

and when tested with a multi meter it shows no change when i rev it

[Sil240]

I have the same EXACT problem.

I have no idea what the problem is....

[rb25drag]

HAHA Welcome fellas!! LOL, I tried an Autometer tach myself,, From what I was told it will Not work Without the converter Box.

I bought the Box but never had a chance to hook it up and see if it worked.

This is what I Bought. http://cgi.ebay.com/ebaymotors...wItem

Mine is still brand new i the box.

I ended up using my SAFC II as a tach.

[Sil240]

I'm using a Defi Step Graph Tach.I'm not really sure but I believe that it did work a long time ago.This was when my 1st harness was wired and the car wouldn't start.I would crank it and I could see the tach jumping a little.But now I get absolutely no movement, after the opening demo.

[burninskulls0911]

HAHA Welcome fellas!! LOL, I tried an Autometer tach myself,, From what I was told it will Not work Without the converter Box.

I bought the Box but never had a chance to hook it up and see if it worked.

This is what I Bought. http://cgi.ebay.com/ebaymotors...wItem

Mine is still brand new i the box.

I ended up using my SAFC II as a tach.

a friend of mine has an autometer tach in his s14 with an rb26 without the converter box and it works fine how do you hook up the converter box?i guess ill try it

[rb25drag]

It has a wiring diagram with the converter, But I really don't know how they work. I have never hooked it up.

[Bluefire]

I'm 99% sure you need the convertor box to hook up an autometer tach to a nissan. The signal the ecu sends out is different than the signal the autometer tach needs

-Bluefire

[drftnrps13]

YO DONT NEED A CONVERTER BOX!!!!! why does eveybody say this! check over ur wiring to make sure u wired it correctly. ur tach just might be bad!

pin7 for tach signal.

[Sil240]

Anyone ever get anywhere with this???Because I still don't have any signal to my Pin # 7 on the ECU.

NOTHING is coming out of the ECU.

So I went ahead and bought one of those Dakota Digital SGI-8 Boxes to hook directly to the Coil packs.

[jacksonbrown]

I have the same prob on s2 rb25 and Stewart Warner tach. I get if I remember right 200-400ths of a volt fluctuation on tach output of ecu. I have seen an inductive pickup box for tach on internet somewhere. Also some solder together youself fix . I googled prob and found tons of people with same prob so its not the tach,