I have a problem. I just got a 5" tach with shift light but the kid that had it before me had it in a civic so I know he had to change it for the 4 cyl. there are 4 wires out the back. 2 orange and 2 brown. all four are not connected to each other. on a v8 app would they need to be together? I could not find any info on the autometer webside thanks.