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Old 05-22-2025, 01:41 PM
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Peter Serio Peter Serio is offline
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Join Date: Mar 2000
Location: Columbus, OH 43209 USA
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Default Underdash wiring

One idea I have for you, which is a copy of the way GM did it.

On all 64-67 Tempest, Lemans & GTOs. Regular gauges or rally (all were made like this) the main wiring which comes up from the fuse-block; in behind the gauges, taped into that harness is one plastic "arrow."

On the back of the gauge housing just above where the speedometer cable threads on you will see a small hole. This hole is in every gauge housing (64-7) A body Pontiac, the arrow that is part of your dash harness plugs into this hole.

That arrow takes the strain off of any bulb socket(s) and/or plug-in(s) which would otherwise take all the weight of the harness.


Once the arrow is removed the first time it is typically damaged beyond re-use. Blue outline: if it is cracked or broken you should replace it. I used to use a pair of tiny ty-wraps and or electrical tape to secure the new arrow to the bundle. (Make sure it is in the same place +- 1/4".)
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Last edited by Peter Serio; 05-22-2025 at 01:56 PM.
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