As per this thread
Gauge API, even if it has been deprecated for MSFS2024 is still usable but should be replaced by others API (if any features is not doable anymore, please make a dedicated ticket on DevSupport).
OK, so what about excecute_calculator_code() and format_calculator_string() (and gauge_calculator_code_precompile() to make the former more efficient)?
I mean the programmatic vars access is nice (with the dedicated functions), but ultimately calculator code can do it all. There are literally WASM modules out there whose only purpose it to allow remote execution of calc. code. This is a very powerful feature.