tach hook up?

i have an older auto meter 3 3/8 tach in my cuda,, i have the msd tach hook up and the dakota reader.. how does this get all hooked together so i can use it with my tach?..5.7 hemi with an A500 trans.. i know i have to run the MSD adapter off the pink wire on the coil.. after that im lost,, any help or do i need a whole new tach?