 
 struct EngineVariable
 {
-  char shortLabel;
-  char longLabel;
+  String shortLabel;
+  String longLabel;
   double currentValue;
   double previousValue;
   double minimum;

}

void loop() {

  currentMillis = millis();
  if(currentMillis - lastMillis >= interval) {
    lastMillis = currentMillis;

  lcd.createChar(4, fill5);
  
  lcd.begin(20, 4);
  lcd.print(engine_clt.shortLabel);
  lcd.setCursor(0, 2);
  lcd.print("TGT");

