That'll work. I believe TP Dye-Lite is the stuff sold on ebay. Use the universal dye for engine oil, PS, tranny, ect. Don't let anyone talk you into fancy UV lights either. Any cheap LED UV light will do as long as the wavelength is close. AC suppliers sell such lights. Even my Fenix L2D-CE (a great flashlight btw) lights the stuff up and it's not UV.
Again though if you have an AZ nearby get their dye. The same firm has different products for oil and coolant but AZ stocks both. Wish I could remember the damn manufacturer as they have a website. It's on the product package. Stuff is great. Potent too. Add to the typical 7M and you'll have a day-glo lime green engine in no time and that's without UV.