Hi Larry.
First of all, Thank you!
I draw the art in Adobe Illustrator. Having the real car on hand and being the one who striped it, I just scaled them down and tweaked them to be printable.
The dash was masked and airbrushed (by me) but for the model I just took measurements from the kit dash and drew decal artwork to fit it.
(My "real" job is being the decal artist for Scale-Master Decals.)