i am installing an aftermarket tach, and have followed the directions
provided by the tach manufacturer, but so far have not gotten the tach
to read over 1000rpms, and at idle the tach registers around
100rpms... which i know is not accurate. this is my troubleshooting so
far:
1- double-checked the ground, ran new ground- no difference.
2- checked the switch on the back of the tach- made sure it was on 4
cylinder- which it was.
3- checked the power wire, getting +12v
4- the tachometer wire that gives the tach the signal for rpms was
listed by the tach manufacturer: blue w/ black stripe located on ECU
for the 91 sentra. when that location gave the readings described
above, i checked the directions and found the black w/red stripe on
the ignition coil that is listed for the 1990 sentra. hooking that
wire up resulted in no reading from the tach.
so that sums it up- anyone have any suggestions? thanks!
robbie