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Re: LED dash lights

Posted: 30 Jan 2017 17:05
by SteveEdmonton
So the fix turned out to be pretty simple once I had a good look at the situation and spent 10 minutes in the Canadian Tire plumbing section.
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These fittings-- 99 cents apiece, and as it turns out I really only needed 1-- are absolutely the perfect size. They're 3/4 x 1 inch adapter pieces for working with poly pipe. And their dimensions are absolutely perfect for this purpose: inner diameter 15mm, outer diameter 22mm.

First step: I cut two sections from the smaller side of the adapter. Each is 8mm long, which is just enough to prevent the front end of the LED bulb from touching the arc of the dome, while still allowing the bottom section of the radial LED emitters (if that's the word) to shine within the dome itself.
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I used JB Weld to glue these little "extension tubes" onto the back of the tach, on top of the clear plastic domes. I did this with the tach out of the instrument cluster so I could see what I was doing.
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Here it is re-assembled.
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The bulbs look like this, mounted in the standard tach lighting harness....
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It's hard to see, but here they are, inserted into the end of the new plastic extensions. They fit perfectly-- just a little bit of pressure, and the socket "pops" into the end of the pipe.
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Assembled, installed, and powered up, here's how it looks.
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As you can see, the tach lighting isn't quite the same colour as the other instrumentation lighting. Both types are sold as "warm white," but the colour temperature of the wedge-mount bulbs (used for most of the instruments) is 3000K while the bayonet-base tach lights are 2700K. I really didn't notice the difference while looking at the lights in the car. Maybe I was just too relieved to have them all working? Anyway, you can certainly see the difference here in these photos.

Best part of all: no hammer needed (thanks, Keith)! :o

Re: LED dash lights

Posted: 30 Jan 2017 17:18
Nice job Steve. I will be retrofitting mine shortly. Good job on the Canadian Tire stuff.

Re: LED dash lights

Posted: 30 Jan 2017 17:25
by Byron510
Sometimes the "fix" in concept is worth more than the actual job.

Nice work, and certainly a step in the right direction.

It's been years since I've had a late dash. But my 69 coupe dashboard sure could use some light. To be honest, I have no idea what bulbs styles are actually in that one. The 68 dash in Ole Blue however uses the same bayonet style as your dash does.

Modification noted :-)


Re: LED dash lights

Posted: 01 Dec 2017 16:27
by tr6racer21
datzenmike wrote:Are the LED lamps dim-able with the switch?
Mike I am planning my LED upgrade and thought i'd answer your question too. In order to make LED lighting dimmable you need to use a Pulse Width Modulator (PWM). Big words but they can be had for just a few bucks. I've even seen them with a key fob remote control

Re: LED dash lights

Posted: 02 Dec 2017 17:15
by stitebunny
Thanks a lot for taking the time to post this!
Did it today.
Great improvement!!