Vitara JLX 4dr Auto Tacho Not Working

[fixkick]

its bad that tachometer if the brown wire, tachometer line goes dead or funky you get stalled engine or at the least CEL glows and DTC #42.
the tach has 3 wires, 12v , ground and signal. brown is signal.
pin A1 (y1) is tach input to ECU, (ECu just monitors this pin)
page 11.
http://www.fixkick.com/look/91-complete.pdf
then page 16 same pdf, see B9 dead to cluster B6 is power, and b8 is ground

or a1
here
http://www.fixkick.com/ECU/8v-tbi-schematic91to95.jpg