i been looking and searching but im not able to find out my problem. can someone please help me out, it would be really appreciated please.

my problem is that i bought an integra LS and has a 2000 gsr swap. now everthiny works except the rpm gauge. i heard that on the 2000 motors you need to run a wire to somewhere im not sure where or what wire but in order to work.

please can some one help me with details please?? i appreciated in advance for stopping to read this