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#1
09-26-2013, 02:24 PM
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68 GTO Dash Tach
I just purchased a 68 GTO. The tach is not hooked up. My problem is I don't know what type it is. I know the prown wire is for the tach. It is there. The tach has three terminals. Someone labled them: 12v, negative , grd. In all the books I look at there is only one terminal for the brown wire. What do I have. It looks original and is a 5100 redline.
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#2
09-26-2013, 10:26 PM
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Sounds like someone has replaced the original meter movement and circuit with an aftermarket tach unit.
Exactly what I'm planning for my tach, too.
__________________
"Keep your stick on the ice...and your head up." 1910 Buick Model 19 Touring 1923 Cadillac 5 passenger coupe 1933 Pontiac 4 door sedan project 1933 Sport Coupe project 1968 GTO, 428, THM400, 2.73 posi cruiser 1969 Chevrolet C10 Fleetside, 350, THM400 1958 Buick Caballero 4dr hdtp wagon 2018 Ram 1500 to tow stuff 2024 Buick Encore GX |
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#3
09-26-2013, 10:38 PM
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Maybe 12v is + for the light, negative is for the coil, and Grd is the - for the light ? Not sure just guessing.
__________________
462,Eagle rods, Ross pistons Crower 10919 Kre 85cc heads RPM intake,800 quadrajet Doug's headers, 2.5" Pypes x pipe and race mufflers.TH400,10" Continental Jim Hand special, Moser 12 bolt 3.42 gears, posi, M/T ET street radials 255/15 |
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#4
09-27-2013, 08:10 AM
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Can you take a picture of the back of the tach and post it?
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#5
09-27-2013, 08:12 AM
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Will do. Hope to have it posted this morning.
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#6
09-28-2013, 12:59 PM
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pictures
Here is the pictures of my tach.
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#7
09-28-2013, 05:38 PM
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I'm sticking with my reply. The meters been changed over to a typical aftermarket tach movement.
The brown wire from your coil (-) goes to the terminal labeled negative coil. Run a +12V ignition feed (hot with key on only) to the 12V terminal. And run a good ground to the ground terminal. That tach movement will work with points or GM HEI.
__________________
"Keep your stick on the ice...and your head up." 1910 Buick Model 19 Touring 1923 Cadillac 5 passenger coupe 1933 Pontiac 4 door sedan project 1933 Sport Coupe project 1968 GTO, 428, THM400, 2.73 posi cruiser 1969 Chevrolet C10 Fleetside, 350, THM400 1958 Buick Caballero 4dr hdtp wagon 2018 Ram 1500 to tow stuff 2024 Buick Encore GX |
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#8
09-29-2013, 09:42 PM
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Ground goes to a good know ground, coil negative goes to coil negative and bat+ goes to a constant 12v source.
__________________
1967 GTO, 432 (428+.030), 4-bolt mains, factory Nodular crank, scat rods, icon dished pistons, Lunati HR 243/251@.050, .618/.622 lift, Edelbrock 72cc round port heads, 10.5:1, offy 2-4 intake, Edelbrock 650cfm carbs, Super T10 trans (2.64 first), BOP 10 bolt w/ Eaton posi and 3.36 gears |
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#9
10-21-2013, 01:47 PM
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Is there a kit you can buy to change over to the new tach movement or do you have to buy the complete aftermarket tach and switch the internals?
__________________
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