If they happened to give you a sender from an 80 PSI gauge from a large truck (doubt it ) then it would do that. keep in mind that the gauges are junk also. I should know with all the dashes I've redone. In the 85 I just bought the OP, Gas & temp gauge were bad. those stinking OP sending units are high $$ too! I have a few good old ones that I keep around from parted out trucks. call the store you bought it from and go through what you want it for and see if they give the same part number as what is on your empty box? Good luck, DAVE
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"been there, done that, ruined the T-shirt".
2007 LBZ GMC Sierra, ECSB
2006 LM7 RCSB Silverado
98 Vortec project.
94,3500,6.5L 4L80
81 SWB GMC POS finally gone
73 Pinto, stock, w/CragarSS's-eww 
84,C10 SWB-Yella,stock
86 K10 SWB-Red, hopped up 305,4/S
LOTS of Cummins trucks.
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