need wiring help! (tach adapter)

[BlAcK95sE]

i have a 95 240 (obdII) with abs. motor is a rb25det seriesII. i need to know where to wire in the signal wire for the tach adapter. i have read pin number 7 and pin number 35 also how do you know what pin number 7 or 35 is?

[Carl H]

did tweaking the stock tach like i mentioned not work?

[BlAcK95sE]

did tweaking the stock tach like i mentioned not work?

i don't have a tach to compare the rpms to. the only way i would be able to adjust it is to set the tach at idle to around 900 rpms. so a friend of mine gave me his auto meter tach adapter.

[Carl H]

ah, well the wire you are looking for is pin 7 on the ecu plug.yellow with a dark blue tracer.ive found 'borrowing' a tach from advance auto works, use it for 5 min then return it claiming it doesnt read on your car.

[BlAcK95sE]

ah, well the wire you are looking for is pin 7 on the ecu plug.yellow with a dark blue tracer.ive found 'borrowing' a tach from advance auto works, use it for 5 min then return it claiming it doesnt read on your car.

ok pin 7 it is yellow with blue tracer i never thought about "borrowing" one and i work at a auto parts store part time lol.

thanks alot carl with out your help i dont know how i would have done the swap lol

[BlAcK95sE]

ok i just want to make sure i am getting this right! i have the auto meter 9117 tach adapter. so the red wire goes to the ecu side of the yellow wire with blue tracer, and the red green goes to the coil side of the harnss. i this right? i know black is ground. where do i wire in the gray wire??????

auto meter instructions

http://www.autometer.com/downl...1.pdf

thank in advance.

[Sil240]

The tach adapter makes the stock Tach work???

I have a Defi Tach and it did work just connecting it to the #7 pin on the ecu.

[BlAcK95sE]

The tach adapter makes the stock Tach work???

I have a Defi Tach and it did work just connecting it to the #7 pin on the ecu.

i was hoping it would ..........

[BlAcK95sE]

anybody!!!!!!!!!

[Darius]

Alright I looked at that wiring diagram and it doesn't use the tach output wire. The red wire is hooked up to ignition power (ON power) and the red/green wire is hooked up to the positive wire on the #1 coil. This would be AF90 on the RB25 wiring diagram which is black and red out of the ignitor. Crap, since you have a seriesII motor your wire to the #1 coil will come directly out of the ecu and lead to the coil. Somebody else can chime in and help you with that or you can trace the wire through your harness with a multimeter and tap into it under the dash for a cleaner install.

Hope that helped.

[Carl H]

or just send me your tach man and i'll calibrate it...