Hi, 

That's possible with a suitable resistor divider. Which YourDyno version do you have? Open the box if you are unsure. I can let you know the right resistors to use. 

I just placed the order last Thursday for my yourdyno package. I will let you know which version when it arrives. Thanks for the help.  

Ok, you will receive a Standard v5. It has a 20k input resistance. So if you add a ~40k resistor in series with the 12V input then you can read 0-15V. In the Aux setup you configure 0V input to be 0V and 5V input to be 15V. 

@admin Thanks for the help.  So this is what they call a voltage divider?  This is so cool. Now I’m curious if there’s a way to use one of the aux inputs to monitor a second thermocouple. I think I read someplace that this is possible utilizing a small conditioner board.  This project has been so much fun.  It’s finally coming together.  Thanks

would this amp allow me to add a second thermocouple?  

https://www.adafruit.com/product/1778?gclid=CjwKCAjw586hBhBrEiwAQYEnHQY_QmQsXa3mzpS2jyEKSiDJYsOcks0Hy0mf2821t62vgtAOl0r6VRoCy8kQAvD_BwE