Shift Light Install

[fmlycar]

I have a S1 C34 which is run by an r34 gtt power fc. I'm trying to install a gizzmo shift light, but when I splice into the tach drive signal (pin 5) I loose my tach all together, but the shift light receives the signal, as I have set a shift point and used the hand controller to confirm light is displayed at correct rpm.

 

Is the any way I can receive a tach signal and still have the factory tach in the dash to continue to work? Or is there another wire I can tap into that will work?

 

Or do I need to use a pull up resistor to amplify the signal?

 

 

 

 

 

 

[Binarydata]

As long as the signal is still getting to the tach it should work. Double check your splice didn't brake the connection, if not, disconnect the shift light and see if it works again.

[fmlycar]

As soon as I remove the wire for the shift light the tach works again.

[fmlycar]

All sorted. Fitted a 10k 1/2w resistor as a pull up from 12v and now it all works perfectly

[spudtatoe]

Yeah my guess would've been it was sucking the power, glad you got it sorted.