RPM/Tach/Shift light problems, help!

[v8klla]

Alright, so I need either a tach or a shift light to go racing this weekend. My gauges are jacked and the tach basically stopped working, so I could try and get another cluster by tomorrow. However, I just got a shift light...

DSMlink still reads RPM, but I cannot get a tach signal for the shift light! I tried the white wire from my 1G CAS and also pin 58 on the ECU, niether of which work!

I have checked the light on another car and it does work, what am I doing wrong?

[Shane@DBPerformance]

Does your car have an MSD?

[v8klla]

Nope, Coil on plug but stock ignition otherwise. 1G CAS on a 1G head, no crank position sensor anymore, signal comes from CAS.

[Swifty1638]

did you ever figure this out? Does the shift light signal normally get it's signal from the crank position sensor? Or, is it the white wire on the 1g CAS?

-A. Swift

[turbotalon1g]

I just put in my shift light yesterday and i tested it at 2k and it was equal with the tach. Then i set it to 7k and the stock tach would say 6800rpm. I used pin 21 from the ecu, which i believe is the crank angle sensor. I got that info from vfaq.
My question here is, which one is right?

[Goat Blower]

The shift light, the stock tach is slow. I used to log 7600 rpm and my tach only read 7100 back when I used the stock ECU.

[turbotalon1g]

Thx steve, i appreciate the help.

[Swifty1638]

So, where did you all attach the wires for your shift light? I am doing pin 21 off the ecu's big plug, 4th in, bottom row. It looks like it's a black wire, but I thought that was ground?

-A. Swift

[turbotalon1g]

lol, i just got done redoing it, yeah it is a black wire and it sounds like you have the right one. my tach light had 3 wires, tach, power, ground.
Hope that helps, i love my shift light its the bomb!

[Swifty1638]

that's the same as mine. u get it from summit? mine's adjustable, so i didn't spend like 200 for all the pills, and shit. what did u run the power wire off of?

-A. Swift