If you look at this site you may find that you don't need an incubator for these eggs... http://www.adcham.com/html/taxonomy/species/r-brevicaudatus.html
" Eggs have been successfully incubated by leaving them in situ and also by removing them from the tanks and incubating them at room temperatures that varied between 67ºF and 87ºF. Both methods yielded 100% hatching rates. Incubation times were from 60-75 days. Fertilization from retained sperm has been reliably reported (L. Christenson, personal communication)."
I always left them in the cage and had a really good hatch rate. With my temporalis, I ended up selling them but leaving the cage set-up and I found babies in it several times.