Use bundle exec

dashboard.js

@@ -9,7 +9,7 @@ var blessed = require('blessed')
 const { spawnSync } = require( 'child_process' )
 
 function fetch() {
-  spawnSync( 'ruby', [ 'fetch.rb' ] );
+  spawnSync( 'bundle', [ 'exec', 'ruby', 'fetch.rb' ] );
 
   lineData = JSON.parse(fs.readFileSync('main_loads.json', 'utf8'));
   line.setData(lineData);