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**jocko** · 11-16-2017, 08:09 PM

ditto. Only one I've seen with a sending unit from the factory in 67-72 is the NL2 upper driver's bedside single aux tank - BUT, that GM aux tank instruction sheet circa 1970 sure seems to indicate there was such a thing... The little aux tank switch above the left a/c vent on an NL2 truck is what switches 2 sender sources - but I've also seen three-ways. I'm hoping to someday figure out a way to stick modified correct-ohm sending units (if there are any left in the world) in my saddle tanks to be able to switch between all 3 - even have a travel tanks switch somewhere, I think... Could be a job, but very worthwhile. I'm not a "wait til it dies then switch the mech valve while coasting" sorta guy, although it's been done for ages.

11-16-2017, 08:09 PM	#5
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,934	Re: What auxiliary tank fits this fuel door? ditto. Only one I've seen with a sending unit from the factory in 67-72 is the NL2 upper driver's bedside single aux tank - BUT, that GM aux tank instruction sheet circa 1970 sure seems to indicate there was such a thing... The little aux tank switch above the left a/c vent on an NL2 truck is what switches 2 sender sources - but I've also seen three-ways. I'm hoping to someday figure out a way to stick modified correct-ohm sending units (if there are any left in the world) in my saddle tanks to be able to switch between all 3 - even have a travel tanks switch somewhere, I think... Could be a job, but very worthwhile. I'm not a "wait til it dies then switch the mech valve while coasting" sorta guy, although it's been done for ages.