Compatibility patch:

• With GBRO_VariableGauge plugin. The plugin has been added to the demo as it is a free plugin, but it still has a different terms of usage from the Physics Engine Platformer Plugin. Do review them from the plugin's page. Both plugins are standalone and can function independently.
  

Take note of the plugin order as seen below. 

When adding a gauge to an enemy event, and you would like to reference said enemy event's hp / max hp, use php and pmhp in place of curVarId / maxVarId like so:

Add Gauge:identifier,settingId,php,pmhp,offsetX,offsetY