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Old 06-23-2005, 06:17 PM   #1
70GMCer
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Auto & manual Gauge Harness ?

What is the differance between an Auto & Manual dash harness w/gauges? I've change to auto and really see no differance between the two, other than the column safety switch. Will there be a problem with using my old harness?
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Old 06-23-2005, 09:48 PM   #2
68 Stepside
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My truck was orignally a 250 I6/3 spd, and is now a SBC/auto. Other than being able to start the truck in any gear, I haven't noticed any significant difference in the wiring harnesses. My truck also has gauges.
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Old 06-23-2005, 11:06 PM   #3
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I didn't change my harness when I went Auto! I changed the plug for the back up lights. Which also go through the neutral safety switch. But don't remember how I ran the wires for the rest of the connection. But it works, only starts in Park and Neutral and the back up lights do work! Don't remember it being real hard.
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Old 06-24-2005, 04:36 AM   #4
JIMs70GMC
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I went the opposite way and the only issue I had were the back-up lights and neutral safety switch. I put an auto cab on a manual chassis, I also used the manual engine wiring harness. To add to it at the same time I went from GMC front to Chevy.
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1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs
1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX
1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears
1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now.....
1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone.
1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed.

1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm
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Old 06-24-2005, 05:53 AM   #5
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Thanks, that's what I was thinking.....I am putting in a "Lokar" backup light switch on the transmission and just going to hook back up my harness.......Thanks again guys...
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