Another guess would be that fuel from the tanks could also have powered a seperate generator as well and the dipstick was used to measure fuel use so that the ignition did not have to be turned on to view the fuel guage.
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Cheers
Cliff Hutchings
aka MrRoo S.I.R.
"and on the 8th day he made trucks so that man, made on the 7th day, had shelter when woman threw him out for the night"
MrRoo says "TRUCKS ROOLE"
