98 ranger aftermarket tach help

[William Spitzer]

I got a sunpro tach for pretty cheap and i wanted to hook it up, I can get The light in the tach to turn on but I can't find the wire to splice into to make the tach actually work, I've read everything I can find but I can't figure it out, it's. 98 with the 3.0, 5 speed, Any suggestions would be greatly appreciated.