Topic: 4-speed '66--Plugging Original C4 Speedometer Hole?

[drummingrocks]

I guess you know that cable goes behind the carpet and not through it???

Oops!  I'll need to fix that!  So the carpet lays over the cable entirely?  Is the carpet cut at all to make it easier to route the cable? 

[CharlesTurner]

Oops!  I'll need to fix that!  So the carpet lays over the cable entirely?  Is the carpet cut at all to make it easier to route the cable?

No cuts in the carpet, the cable just rests up against the firewall pad.

[midlife]

Pic showing hole circled in red....

Charles: just to be clear: that is the C4 hole, correct?  That's where my speedo cable enters the passenger compartment, both before and after the restoration.

[CharlesTurner]

Charles: just to be clear: that is the C4 hole, correct?  That's where my speedo cable enters the passenger compartment, both before and after the restoration.

The hole I circled in red in the picture is the typical C4/3sp speedo cable hole.

[jwc66k]

I'm still laughing. Through 14 replies did anybody mention the plug's part number, so I will - per Osborn "1966 Mustang Body Assembly Manual", pg12 "377949-S". It's dimensions are found in Osborn "Standard and Utility Parts Catalog, July 66" on pg 58 (my measurements are 0.750D HOLE, 0.100PNL, 1.312OD, 23/64T, BLK RBR). The most common use for 64-66 is the two hole plugs in the trunk over the frame rails. The plug is a common item used on all years to cover control holes.
Jim

[CharlesTurner]

Thanks Jim, but I did mention in a previous post that I thought it was the same size used on the trunk floors.

[jwc66k]

Charles,
 You are correct, and sorry about that. My point was that a reference to a part number gives a definitive item, right or wrong.
Jim

[CharlesTurner]

Charles,
 You are correct, and sorry about that. My point was that a reference to a part number gives a definitive item, right or wrong.
Jim

Absolutely, and thanks for the input as it confirmed my "guess."

[CharlesTurner]

Has anyone else ever seen anything like this?

Haven't seen it before and it wouldn't be normal.  Not sure that I would leave it as-is since this may cause the speedo cable to be in a bind and malfunction.