scruff Posted April 28, 2019 Report Share Posted April 28, 2019 Hi guys, my 48 ply speedometer changes color (green to white) about 40 mph. I thought it used to be about 50. Any thoughts or ideas ? Thanks Quote Link to comment Share on other sites More sharing options...
Tom Skinner Posted April 28, 2019 Report Share Posted April 28, 2019 It should go to yellow around 40 then red around 50. There is a prism in the unit that does this. Quote Link to comment Share on other sites More sharing options...
Frank Elder Posted April 28, 2019 Report Share Posted April 28, 2019 My D-24 does the same thing but there is no prism....there is a piece of clear material that is dyed green, yellow and red and a bulb shines through it. A long time ago someone on here had their p-15 speedo apart and ??? recolored it to shine better??? @Young Ed maybe....its been a long time. Quote Link to comment Share on other sites More sharing options...
greg g Posted April 28, 2019 Report Share Posted April 28, 2019 I believe sharpies were used to renew the colors on the lens that moves with the needle good time to clean off the bulb for brighter light also Quote Link to comment Share on other sites More sharing options...
scruff Posted April 28, 2019 Author Report Share Posted April 28, 2019 Thanks two all. I may have to redo my speedo because I thank the color change is neat. Quote Link to comment Share on other sites More sharing options...
Andydodge Posted April 28, 2019 Report Share Posted April 28, 2019 From the original Oz 1940 Dodge Sales Brochure...." The Speed Indicator takes the form of a bead which in moving over the dial glows Green at speeds up to 30mph, Amber from 30 to 50 mph and Red for speeds over 50mph.........its actaully just a clear part on the circular plastic moving indicator and coloured green, orange and red on the speedo which is allowed to be seen thru the clear area when it moves, simple but effective.........andyd Quote Link to comment Share on other sites More sharing options...
plymjim Posted April 29, 2019 Report Share Posted April 29, 2019 Been driving these old Plymouths since I was 16 & it was always a hoot to go fast enough to see that red speedoo. Had a '57 Buick with a linear speedoometer that did the same thing. Probably there were other makes likewise equipped. Quote Link to comment Share on other sites More sharing options...
Young Ed Posted April 29, 2019 Report Share Posted April 29, 2019 7 hours ago, Frank Elder said: My D-24 does the same thing but there is no prism....there is a piece of clear material that is dyed green, yellow and red and a bulb shines through it. A long time ago someone on here had their p-15 speedo apart and ??? recolored it to shine better??? @Young Ed maybe....its been a long time. Yup I sharpied mine and I got the idea from someone else on here I believe David Maxwell Frank Elder 1 Quote Link to comment Share on other sites More sharing options...
dale Posted May 1, 2019 Report Share Posted May 1, 2019 It went to red as that is the color of blood.. My first motor swap was a Chevy 265 with a powerglide in a 47 Ply. The speedometer read about 15 mph fast at 65 mph so my passengers were very uneasy when the speedometer turned blood red and the needle read 100. LOL soth122003 and Reg Evans 2 Quote Link to comment Share on other sites More sharing options...
chrysler1941 Posted May 2, 2019 Report Share Posted May 2, 2019 Not only speedometer but my radio left "tune" knob also has color change Quote Link to comment Share on other sites More sharing options...
Dan Hiebert Posted May 2, 2019 Report Share Posted May 2, 2019 On 4/28/2019 at 12:53 PM, Frank Elder said: My D-24 does the same thing but there is no prism....there is a piece of clear material that is dyed green, yellow and red and a bulb shines through it. A long time ago someone on here had their p-15 speedo apart and ??? recolored it to shine better??? @Young Ed maybe....its been a long time. Learn something new even after 27 years with the D24. I Knew the Plymouths' speedos changed color, but had no idea the Dodges' did, too. Never occurred to me. Wow. Quote Link to comment Share on other sites More sharing options...
Frank Elder Posted May 2, 2019 Report Share Posted May 2, 2019 6 hours ago, Dan Hiebert said: Learn something new even after 27 years with the D24. I Knew the Plymouths' speedos changed color, but had no idea the Dodges' did, too. Never occurred to me. Wow. Better get that sharpie out!.....lol. Quote Link to comment Share on other sites More sharing options...
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