How does the Rallye Dash Tach hookup?

Well, no. And you STILL have not bothered to post what it is that you are working on

If you hook "to the star" it will NOT BE FUSED. Power comes in at the BOTTOM

The one you have the arrow pointing to is your dimmer controlled instrument lamps. Do not use that for ANYTHING unless you need "lamp power" for the tach, gauges. That fuse will be completely dead until...........

The tail fuse must be good and working

The headlight switch must be in park or head

The dimmer control must be turned somewhat to the left for "brighter dash lights."