That ghosting is because of the lack of a proper windshield (which I'm sure Mike knows).
The HUD windshields are coated with an invisible optical coating for the specific wavelength of light that the HUD emits.
That way the entire image is reflected off the inside surface of the glass.
A 'normal' windshield will reflect part of the image off the inside of the glass, and part off the outside surface,
with some loss to the 'atmosphere'. So what you probably end up with is 50% reflected off the inside, 20% off the outside,
and the rest is lost. The thickness of the glass is what gives you the 20% 'ghost'......kindof like a phase-shift in the image.
There is a solution
Most auto glass places have access to a kit that they can use to apply the proper coating just in the area
the HUD reflects in. Look into it. It'* alot cheaper than a HUD windshield (which can run upwards of $100), unless you have a low glass
deductible like I do. New windshield every year or two. Fully covered.
Any further training in Lasers, light, or optical coatings will be at my full rate of $35 an hour.