1) All set to go 2) Engaged 3) Engaged in a way 4) Functioning 5) Functioning continuously 6) Functioning smoothly 7) Functioning well 8) Not coasting along 9) Not idling 10) Out of neutral 11) Ready for driving 12) Ready to accelerate 13) Ready to be driven 14) Ready to drive 15) Ready to drive off Found on https://www.crosswordclues.com/clue/in-gear