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Welcome, and thanks for the kind words. It's nice to see a polite person join us.
At the moment I can't think of any convenient, robust manner to connect an oil pressure sensor, since the NC250 engine doesn't have an external oil pipe. However, I'm sure someone will correct me if I am wrong.
Nevertheless, I wouldn't worry about the plastic gears which drive the oil pump. If my memory serves me correctly, all my motorcycle engines employ plastic gears to drive the oil pump, and I have never had any problems with these gears. In fact, I have never even noticed significant wear on any of these plastic gears. I doubt the NC250 engine will be an exception in this regard.
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Spud
"Never argue with an idiot. He will drag you down to his level, and beat you with experience."  Mark Twain
2015 Zongshen ZS250GY-3 (RX3)
2006 Zongshen ZS200GY-2 (Sierra 200)
2005 Honda XR650L
2004 Honda CRF250X
1998 Kawasaki KDX220
Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894
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