RPM Signal for E-manage

[Ajax]

I need some info on how to get the right rpm signal from the e-manage. I had a shop hook it up for me and they told me that I need something to change the signal so that the e-manage can read it, but they were not sure what it was. I do get a signal bit its completely off goes up to 35 000 rpm. I am also going to look how they hooked it up. It should be the brown or a white wire behind the stereo I know I used the same wire to hook up my remote starter right? Can I just tap into that same wire for the signal? Kinda answered my own question, but just wanted to see what you guys did.

 

[GSGoinFast]

I need some info on how to get the right rpm signal from the e-manage. I had a shop hook it up for me and they told me that I need something to change the signal so that the e-manage can read it, but they were not sure what it was. I do get a signal bit its completely off goes up to 35 000 rpm. I am also going to look how they hooked it up. It should be the brown or a white wire behind the stereo I know I used the same wire to hook up my remote starter right? Can I just tap into that same wire for the signal? Kinda answered my own question, but just wanted to see what you guys did.

the tach wire is the white wire in the lower harness