does the s4 t2 ecu pick up tach signals? and if it does which wire is it and another tach be spliced in to pick up the signal? thanks

 

the ECU sends the signal to the trailing coil, the trailing coil sends the tach signal to the tachometer. from the tachometer it goes nowhere, the origination engine RPM signal goes through the ECU from the CAS.

 

so i could pick up the tach signal from the ecu then as the ecu is a "middle man" from the CAS and the trailing coil?

 

You can always pick up the Tach signal from the Trailing or leading coil Bullet connector.That is how you can get a signal to an aftermarket Tach,if that is what you are doing.

 

ok i underststand now. and you are right about an after market tach but i was hoping to try and keep the wires inside the car. thats why i was asking if i could pick up the signal from inside the car at the ecu.

thanks guys for the quick replys

 

Pin/wire 1X on your series four RX. That's 1X of the ECU plug.

 

thanks hailers. i have another question for you. how does the gas gauge on a s4 t2 get signal from the tank?

 

From the White/Green wire. Page 40 of the wiring schematic.

http://www.cochran-racing.com/FSM/s4...NG_DIAGRAM.pdf

 

Good luck fooling w/ that gas gauge. There's a reason I left it alone...

 

What does your gas gauge do/not do?

 

There is nothing currently wrong with my fuel gauge. I am wanting to put a aftermarket fuel gauge in my car. After speaking with sharingan he said that there is no aftermarket gauge that reads the same values as the fc fuel level sending unit so a aftermarket gauge will never work/read correctly. Is this true?

 

I always attached the tach signal wire to the ig - on the back of the gauge cluster.

 

If I said it, then its true.

The one caveat being, there are some aftermarket fuel level gauges w/adjustable senders, that could probably be made to read "pretty close". However they do not come in 45mm and will not work in you modified gauge cluster.

Just follow the writeup in the thread and stop trying to be difficult.