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ray_mcavoy · 11-12-2017, 04:10 PM

Both generations use 0 - 90Ω fuel sending units so you'll be okay using a 67-72 sending unit with the 89 gauge. The 66 & earlier trucks were different (0 - 30Ω) and then I think it was up into the late 90's before they changed again.

11-12-2017, 04:10 PM	#2
ray_mcavoy Registered User Join Date: Nov 2009 Location: Sherman, ME Posts: 2,354	Re: gas tank questions Both generations use 0 - 90Ω fuel sending units so you'll be okay using a 67-72 sending unit with the 89 gauge. The 66 & earlier trucks were different (0 - 30Ω) and then I think it was up into the late 90's before they changed again.