I recently put a OBD1 JDM GSR ECU (P72J) in my 00 Civic Si, everything works fine from what i can see except for the tachometer. everything else on the cluster works but the tach, and im trying to find out how i can fix it. someone told me something about finding a gsr electronic speed sensor for it, but i dont know where to get one or what to even do with it if i had it. right now i have the P2T (stock) ECU back in and everything works fine. any help is appreciated in getting everything to work right with the new ECU and thanks in advance.

cn: obd1 p72j in em1, tach doesnt work how do i fix it?