I have not attached the device directly via serial but I sure can. My goal, is/was to get it to download to the arduino as it is not practical in the end to have the device connected to a computer while operating. But I understand it would be a good first step. Here is the pdf on the manual. It is called a Blaze CHT/EGT temperature monitor.
MGL Blaze TC-6.pdf (1.1 MB)