I found this little switch on amazon, it's awesome... Basically you set a high and low temperature and it turns the incubator on and off using those two set points.
I set one low at 99.5 and one high at 99.7 and it keeps the incubator at 99.6.
https://www.amazon.com/gp/aw/d/B0B39GMYSZ/ref=ox_sc_act_image_1?smid=A1EEC6EKARGX1&psc=1
I set one low at 99.5 and one high at 99.7 and it keeps the incubator at 99.6.
https://www.amazon.com/gp/aw/d/B0B39GMYSZ/ref=ox_sc_act_image_1?smid=A1EEC6EKARGX1&psc=1