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Usual directions found on box of new tach. hook wire color x (usually green) to the green wire on your coil hook red wire to a fused power source black wire to ground x color wire to night light fuse. set tach to 6 cyl mode mount on dash, steering coloum, or where ever you want it. Really about that simple.
yeah, i have a sunpro I bought at autozone (yeah, I know, shoot me)
super easy install, mounted under my flip-down visor. the tach mounting plate is u-shaped, like it should go on the steering column...turned it upside down and used a scew that is holding the headboard up. wires hid well.....best thing I've ever installed.