tried searching aftermarket tach how to in sr20det 240?

[bryn614]

Hey yall it is my first post on here becuase it is getting late and i cant seem to find what i need. i got an autometer tach tried hooking it up to the cluster tach signal. guess what it dont work. so my question is has anyone put in an autometer tach in thier sr powered 240? i have the autometer adapter also if i need it. just looking for someone who knows how to put it in and a quick little how to. i am a tech but i work for a chevy dealership and our cars are alot differant but i love nissans allways owned em. thanks very much. it is a 90' 240 with a redtop if it helps at all.bryn

[ILikeMy240sx]

I dont know how those Autometer ones work but I have a rev counter feature in my turbo timer and that works by hooking up a wire to the RPM wire by the ECU.

Look at a typical S13 wiring guide and its the tach signal line for the gauge cluster. Thats where I have mine hooked up.

[bryn614]

yeah thats what i tried i hooked the autometer tach input to the tahc signal comeing from the ecm wiring bundle the yellow/red i belive but the autometer gauge i think works on a square signal. but thanks for the fast response

[bryn614]

the tach instructions show that the tach input siganl needed to be hoooked up to the negitive wire on a coil with a distributor. but that posses a problem beause the sr is a dis as you all know. just a little more info if it helps

[ILikeMy240sx]

Try the 180 out wire from the CAS. Oh dont forget that they come pre-set as a V8.

[bryn614]

yeah i cliped it down to 4-cylinder i know this might sound dumb but what is a cas? i prolly know i just cant rember.

[ILikeMy240sx]

CAS (Cam Angle Sensor) has two output signals. 1 degree signal and 180 degree signal that is fed to the ECU.

According to the pinout I have its terminal 22 on the ECU and it should be white.

Pinout says 30 or 22 I dont know why there are two wires for the same signal....

[bryn614]

o yeah thats right. well i will give it s try tomrrow at work. thanks alot for your help bro, great site