Yep, good pick up...lol...Didn't even notice that!
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Is it running duel fuel?
The 1990 GQ was pre fuel injection & the 300a gas mixer (commonly used on this model (TB42s) had a pull cable to raise the gas hat when running on petrol for better air flow & it was most commonly placed at the bottom of the dash right under the steering column. this is usually a silver or black "T" type handle.
iv got the same lever on my 88 gq and i think he means gq. acdc720 you just pull it in to activate and let it out to deactivate it. it just gives you more Wheel Travel (flex) when 4WDing witch is good.