bought a 89 formula previous owner did a old sbc 350 swap tach, oil presure, and temp gauge dont work they added little aftermarket gauges on a bracket to fix this but they look like crap where do i start to get the stock gauges to work so i can get rid of these

 

Depending on what aftermarket cr*p you have,
they may (most likely ) use the stock sender units in which case all you have to do is connect
the old wires from the dash gauges to the correct sender ( tacho wire goes direct to coil )

If aftermarket senders have been fitted then you will need to fit stock ones

 

ok that helps kind of