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Old 12-16-2017, 11:43 PM   #8
ElGracho
Gentleman Jim Driver
 
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Join Date: Nov 2002
Location: Poulsbo, WA
Posts: 1,550
Re: Identifying bulb purpose on instrument housing

That is a fiber optic light. It pipes light from that bulb over to the ashtray.

http://67-72chevytrucks.com/vboard/s...ht=fiber+optic
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Joe
'75 GMC Gentleman Jim
'84 Chev C10 Short Wide - Super duper plain (manual steering, manual brakes, no dome light, no cig lighter)
'85 Chev C10 Short Wide - Super plain Vortec 4.8 4L60E trans
also: '81 K30, '83 C30 Crew Dually, '84 M1028 CUCV, '85 M1009 CUCV, another '85 C10 SWB, '89 R3500 Flatbed
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