Change variable from multiple sheets?

I have an excel workbook with multiple sheets that aggregate costs and revenues of different technological components (set up in different sheets) in a system.

I want to have a main worksheet, where users can change a small selection of important variables from the technology sheets. I also want those important variables to be defined and editable on the technology sheets.

I've been using named ranges to manage variables, but I'm not sure how to link two cells on different sheets to one variable. For example, I want to name a variable "oilprice" that is referenced in different formulas. I want to be able to change the variable "oilprice" from the main worksheet and the electricity technology sheet in my workbook.

Similarly, I want to be able to check a box on both sheets for "Turn on Electricity" and have the checkbox on the other sheet change as well.

I've been looking around on google and stackoverflow but can't find an answer. Thanks!