Sorry everyone if this is the wrong place to post.  I saw it was for chevy V8 and in 70's Datsun Z cars so I thought this is where to go.  Anyways all your input has been a great help.  I went to the first place of brokenkitty website and called them.  They said no prob and are sending me a cable that adapts Datsun to chevy in the cable itself.  I am figuring that I will still need to get this converter box to go from electrical to mech.  But this way I should be able to stay with the factory gauges.   Any thoughts will be helpful as I am very new to this.  I always loved cars and always wanted to get dirty with them and learn how everything works.  I imagine it's like anything, trial and error and wasting lots o' money.  lol