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08-28-2013, 10:58 PM
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#1 |
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Carpe manana
  
Join Date: Dec 2010
Location: Eau Claire, WI
Posts: 12,449
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What's this firewall grommet/brown wire for? Where's the tach hole?
Pic below shows what I'm interested in. I didn't have a flashlight with me so couldn't follow the wire all the way but it went along the LH frame rail toward the rear. Fuel sending unit? On a pickup this dimple is used for the tachometer harness grommet. On a K5, which dimple is for the tach hole and which is for an aux battery harness? If anyone has pics to post of an OEM tach harness/aux battery harness at the firewall I'd be grateful. I'm adding both in September. Thanks, Pete
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1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308  Members met: ORANGBLAZ, 2003 silverado, MikeCofield, BB72CHEVKT, Duncan&Son, Sameyrasmea72, THENEWMEXICAN, HotRod C/10, brianthelion02, Sport/Truck, ryanroo, michael bustamante, Dirt's72, Already Gone, WestButteTruck, 57taskforce, Moreyel, painterljp, AASmedic, SoCoC10, Lumaestas, carbuff382, Chevyland
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08-28-2013, 11:58 PM
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#2 |
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Registered User
Join Date: Dec 2009
Location: Independence Mo
Posts: 4,119
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Re: What's this firewall grommet/brown wire for? Where's the tach hole?
Not sure where the tach wire hole is supposed to be,probably one of the other dimples below this one. The tan wire is for the gas gauge.
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My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html |
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03-27-2024, 04:53 PM
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#3 |
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Senior Member
 
Join Date: Sep 2011
Location: Owosso, Michigan
Posts: 2,860
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Re: What's this firewall grommet/brown wire for? Where's the tach hole?
TTT ????
Any answers as to which one is fuel sender and which is Tach?
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1967 C10 SWB Owner - Rustbelt Restorations |
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03-27-2024, 10:03 PM
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#4 |
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Registered User
Join Date: Jan 2011
Location: Delaware and Long Island, New York
Posts: 3,456
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Re: What's this firewall grommet/brown wire for? Where's the tach hole?
The tachometer wire is red, the brown is the fuel sender DaHos
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03-29-2024, 11:22 AM
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#5 | |
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Senior Member
Join Date: Sep 2011
Location: Owosso, Michigan
Posts: 2,860
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Re: What's this firewall grommet/brown wire for? Where's the tach hole?
Quote:
Fuel is Lt Brown I do not have a blazer with factory tach to referance.........?? So my assumption would be the fuel sender wire is in the top hole as pictured but when optioned with a tach an addition 3/4 hole was drilled below the fuel sender hole. Just want to put them in the correct location as per factory.....
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1967 C10 SWB Owner - Rustbelt Restorations |
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03-29-2024, 12:57 PM
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#6 |
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Registered User
Join Date: Jan 2011
Location: Delaware and Long Island, New York
Posts: 3,456
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Re: What's this firewall grommet/brown wire for? Where's the tach hole?
My 1970 Blazer has been played with by other owners in the 55 yrs since it was built in Aug '69 hence the additional wires from the speedo plug, (HEI hot lead) You are correct on the Lt Brown wire, here is the location on my truck. As usual a sideways picture 😔
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03-30-2024, 07:02 AM
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#7 |
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All stock and staying that way
Join Date: Jul 2003
Location: Elkland, PA
Posts: 1,845
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Re: What's this firewall grommet/brown wire for? Where's the tach hole?
1970 will be different than the other years due to the pink wire that is the power wire feed for the TCS system. Brown is tach, tan is fuel level.
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1970 K/5 Blazer CST 4WD, Medium Bronze, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration finally getting close to completion..  1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor...  2017 Sierra 1500 SLT 4WD, Black, 45k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 62k miles, 3.6, 8L45, 3.23 LS, 18" wheels |
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03-30-2024, 07:33 AM
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#8 |
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All stock and staying that way
Join Date: Jul 2003
Location: Elkland, PA
Posts: 1,845
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Re: What's this firewall grommet/brown wire for? Where's the tach hole?
Rotated
__________________
1970 K/5 Blazer CST 4WD, Medium Bronze, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration finally getting close to completion.. 1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor... 2017 Sierra 1500 SLT 4WD, Black, 45k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 62k miles, 3.6, 8L45, 3.23 LS, 18" wheels |
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03-30-2024, 08:34 AM
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#9 |
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Registered User
Join Date: Jan 2011
Location: Delaware and Long Island, New York
Posts: 3,456
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Re: What's this firewall grommet/brown wire for? Where's the tach hole?
Thanks bud
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