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Old 12-19-2006, 05:39 PM   #1
NiM130
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Default 2 questions (boost gauge & LED's)

1.) How do I go about installing an aftermarket boost gauge in place of the stock one? As in, where do the specific wires go to give it juice? I need something a little more accurate than the stock gauge, especially since I'm planning to tinker with the car a lot during the summer.

2.) What type of LED's are in the 740's instrument panel? They are dull and some bright red LED's would be nice. Can I just stick them right in or does anything need to be done with them.

I searched both of these topics and can't find a lot. I know I've seen several LED threads too but I couldn't find them.

I know, these are n00btastic questions too for most of you guys. I gotta start somewhere though!
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Old 12-19-2006, 07:41 PM   #2
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1) Can't you hook it up to any light on the dash dimmer circuit?

2) LED's? I don't there there are any LEDs in my 87 740 dash.
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Old 12-19-2006, 08:08 PM   #3
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Yeah you can hook L,E,Ds to the dimmer circuit . i got bored one day and pulled my dash cluster out ,took out some of the bulbs in back and soldered l.e.ds right in place of the socket . O fcourse it wasnt totally secure, but it worked great and was frickin bright!!
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Old 12-19-2006, 08:17 PM   #4
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Quote:
Originally Posted by ovlov130 View Post
1.) How do I go about installing an aftermarket boost gauge in place of the stock one? As in, where do the specific wires go to give it juice? I need something a little more accurate than the stock gauge, especially since I'm planning to tinker with the car a lot during the summer.

2.) What type of LED's are in the 740's instrument panel? They are dull and some bright red LED's would be nice. Can I just stick them right in or does anything need to be done with them.

I searched both of these topics and can't find a lot. I know I've seen several LED threads too but I couldn't find them.

I know, these are n00btastic questions too for most of you guys. I gotta start somewhere though!


1) any wire that gets power when the lights are on, and a solid ground will get the gauge to light up. but i dont think thats what you're asking.

a boost gauge is not an electrical thing, it is controlled by a vacuum signal. to hook it up you can either T off the only vacuum line under the steering wheel and run both gauges, or you can just simply disconnect the stock gauge and run the line direct.

2) i dont know, but run a search as im positive this has been covered like crazy before.
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Old 12-19-2006, 10:19 PM   #5
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jumpy, that was what I was asking for #1.. is there any specific place that I could wire it that would be best? I'd just use the stock vaccuum line to hook it up.

For #2, if there are no leds in the dash, what kind of lights are back there?

Thanks for fielding my dumb questions guys.
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Old 12-19-2006, 10:32 PM   #6
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The stock bulbs are incandescent. They shine their light almost in a complete sphere and there are prism type plastic that channel the light to other areas of the cluster. The problem with leds is they shine their light straight ahead with maybe a 30- 35 degree angle. The light doesn't get picked up by the "prisms" and channeled elsewhere. The solution of course would be super wide angle leds or installing more of them to light everything evenly.


As for the gauge lighting, hook it up to the rear fog light switch illumination. This way you can dim.
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Old 12-19-2006, 10:52 PM   #7
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Quote:
Originally Posted by Beanie View Post
The stock bulbs are incandescent. They shine their light almost in a complete sphere and there are prism type plastic that channel the light to other areas of the cluster. The problem with leds is they shine their light straight ahead with maybe a 30- 35 degree angle. The light doesn't get picked up by the "prisms" and channeled elsewhere. The solution of course would be super wide angle leds or installing more of them to light everything evenly.


As for the gauge lighting, hook it up to the rear fog light switch illumination. This way you can dim.
If I replaced with colored incandescent blubs, would the light output be pitiful?

As for the gauge, that's a great idea.
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Old 12-19-2006, 11:05 PM   #8
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Quote:
Originally Posted by ovlov130 View Post
If I replaced with colored incandescent blubs, would the light output be pitiful?

Hard to say, but probably ok if you do blue. There's also a layer of colored film stuffed in there somewhere so try different color combinations. Hint: Buy a pack of sharpies and color the bulbs.
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Old 12-19-2006, 11:09 PM   #9
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I'm thinking red actually. Maybe I'll do blue. I know there are pictures of both colors on here somwehere but I can't find them.
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Old 12-19-2006, 11:45 PM   #10
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Quote:
Originally Posted by Beanie View Post
Hard to say, but probably ok if you do blue. There's also a layer of colored film stuffed in there somewhere so try different color combinations. Hint: Buy a pack of sharpies and color the bulbs.
i did that on my old car. lasted for months.
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Old 12-20-2006, 12:39 AM   #11
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Quote:
Originally Posted by jumpy View Post
i did that on my old car. lasted for months.
The sharpies? I want a more permenant solution than that, especially given the fact that this car is going to become a project car in about 6 months.
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Old 12-20-2006, 12:44 AM   #12
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go to a hobby store and get some clear candy coat paint in the color you want?


that would be clear, easy to apply (dip the bulbs in a little) and should last.
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Old 12-20-2006, 12:46 AM   #13
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I used some of the Testors Candy Red on my tails.. that should work for the bulbs. awesome idea, thanks.
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Old 12-20-2006, 12:46 AM   #14
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Quote:
Originally Posted by HonestJhon View Post
go to a hobby store and get some clear candy coat paint in the color you want?


that would be clear, easy to apply (dip the bulbs in a little) and should last.


+100000

the sharpies do wear off, but this stuff wont. cheaper than leds and probably more effective. but not as reliable.
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Old 12-20-2006, 01:41 AM   #15
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you can buy colored bulbs for like a buck a piece.. blue ones were too dim but red are just bright enough.. I'm gonna put some wide angle led's in though..
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Old 12-20-2006, 01:55 AM   #16
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you can buy colored bulbs for like a buck a piece.. blue ones were too dim but red are just bright enough.. I'm gonna put some wide angle led's in though..
brighter than the dull green stock color?
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