I’m guessing the reason there are no temperature numbers on the original gauge is because there likely is a difference in temperature values between that and the digital thermometer as a product of sensor location. People would probably complain that it’s a bad product because of the values not matching. You now just have to note the relativity between them and go from there.
Here you go, I bought the 2 pack but they sell singles also. www.amazon.com/dp/B008RILAWO/ref=cm_sw_r_cp_apa_glt_fabc_TNVG937TTDZC60ZHJ29H?_encoding=UTF8&psc=1
