im having trouble installing this tach i got for my 95 f350 manual trans with a 7.5 460 and all my friends keep telling my different things and im all confused.. please help me out

What kind of tach (aftermarket, OEM)?

If aftermarket, what brand?

Is it new or used?

Do you have installation instructions?

What kind of trouble (getting it to fit, getting it to work, running wires, where to locate it, getting dash apart to replace a dash cluster without a tach with one with a tach, fitting a factory tach into a cluster that did not come with a tach)?

Need a little more information.

Dave / Believer45