no one knows ignition wire for tach???

[hybrid240]

i searched this and found indirect info. i have a 90 nissan 240 with a red top that uses coil packs (4). My tach doesn’t work for obvious reasons. I got an autometer tach. I wired it like this: white-dash lights, red-power, black-ground, and green-tach signal (from ecu). I know this doesn’t work for two reasons, 1 I read about it on mere 2 I tried it.
Now I also read on here that I need to wire it to the ignition. But that’s all any one knew. What I need to know is what wire? It is not the yellow/red from ecu, that doesn’t work.
Thanks
pat

[Vatche]

my tach also doesnt work i have an 89 coupe with the digital cluster but the sr tach and it revs up but idles at 0....meaning the calibration is off or something....anyone have any ideas

[RedtopSR]

I wired my shift light up to the black/white strip ignition wire the one that comes on only when the car is started, not sure if its the same for a tach.

[the head]

1. make sure the autometer is setup for direct fire ignition cars

2. OC 240 and 89 tach wont work with an sr must have a 91 or newer gauge cluster or the japanese cluster to have the tach work

[DuffMan]

1. Buy the direct ignition adapter from autometer

or

2. Use the 180 degree CAS signal (may or may not work depending on tach)

[hybrid240]

thank you duffman...something i can try out. i will see if i can get it done today. ill post how it goes.