ok so i bought my 95 240sx and the tach doesnt work because he said they didnt connect a wire and he says its an s13 sr blacktop head with an s14 sr block.. i have ordered an autometer tach with the tach adaptor and when i connected it to the blue/red positive wire for the coil packs my car started to sputter bad. i even connected it to the cas wire and it did the same thing.. so im saying fuck that tach and i want to get my stock on working so if anyone knows how or have any input thanks.. oh and when i had the aftermarket tach on it says it was idling at 2000 rpm then it started to sputter

 

... so an aftermarket tach caused the engine to sputter?

implying that it ran perfectly before you attempted to install the new tach...

right?

 

yes and it sputter when it was connected to the psitive coil wire or the cas wire..

 

i just want to know how to hook up the stock tach with my sr cause i returned the other one

 

anybody???

 

Look up a swap wiring guide. All the information is in there. The signal for the tach comes from the ecu into the cluster via the dash connector under the dash on the passenger side. IIRC, the tach is a yellow/red or yellow/orange wire on the ECU, never worked on an s14 so not sure if its the same on the chassis side.

 

well i read that yellow/red wire from the cluster plug was connected to the yellow/red to ecu which mine is but it still doesnt work. i even connected the tach to the rpm wire no signal...