hey Babi
after I posted and asked I decided to check the 109 to see if there was a "ata" gauge and sure enough that big fat gauge above the tach was marked ata...DOAH!!
....the last few nites I've been concentrating on the tach,oil and water gauges only...oh well now I know
so this gauge indicates how much air is being introduced into the engine cylinders?.....were these engines turbo charged?