should the economy gauge sit completely to the left in the black at idle? sometimes it does not sit all the way over at idle. i hear this might be a vaccum leak. does this mean its a vaccuum leak for the gauge or for something else and the gauge is just telling me? i did a search and didnt come up with a definitive answer. THANKS The car is a 420sel 1986

__________________
1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual