thanks i have revamped the mod since but i am still having an issue that i am unsure how to resolve the entity heat engine has a heat buffer and we have a hidden energy interface the control call for a nth tick function at 60 but then i get an error where the heat buffer is not found i will again ...

The new mod set having an issue with a nil value
on line 33 in the definitions any advice

i had an idea to make a heat based engine that consumes heat and outputs electric i had small success when i used a heat interface. Do i have to create a new item with a sub directory? see file need help with this what am i missing