Author Topic: LED bulb in Tachometer  (Read 2428 times)

dakman29

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LED bulb in Tachometer
« on: May 18, 2021, 19:03:24 »
I have both my speedometer and tachometer out of the car after recalibration and cleanup.  I decided to replace the incandescent bulbs in both with amber LEDs from superbright.  They fit fine in the sockets and both went into the speedo without issue.  In the tachometer though I could only fit the LED in one of the two holes in the back of the instrument. The other hole has a noticeably smaller bore and the LED will not fit.  At this point I don't think I have an alternative other than putting the incandescent bulb back in that hole and the LED in the one where it fits.  Has anyone encountered a similar problem.  Thanks

GM

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Re: LED bulb in Tachometer
« Reply #1 on: May 18, 2021, 21:19:02 »
You sand/grind down the diameter of the LED to make it fit
Gary
1971 280SL - Sold
(98 from the end of production)
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Merc_Girl

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Re: LED bulb in Tachometer
« Reply #2 on: May 18, 2021, 22:44:49 »
Or make hole slightly bigger? I had to do this with the headlamp housing for my side light LED bulbs as hole was fractionally too small
230SL

mrfatboy

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Re: LED bulb in Tachometer
« Reply #3 on: May 19, 2021, 00:56:53 »
As Gary, I ground down the bulb.
1969 280sl (Aug 1968 build)
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4 Speed

Paul & Dolly

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Re: LED bulb in Tachometer
« Reply #4 on: May 19, 2021, 07:08:15 »
Or cut the narrow part of the tube off,  and fit the LED from the inside of the TACHO cover

Paul
« Last Edit: May 19, 2021, 07:19:42 by Paul & Dolly »
Paul (located in Cardiff - Wales - UK)
1967 Early 250 SL (Auto) White
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dakman29

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Re: LED bulb in Tachometer
« Reply #5 on: May 19, 2021, 13:32:11 »
All very helpful solutions. Thanks!

mmizesko

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Re: LED bulb in Tachometer
« Reply #6 on: May 25, 2021, 16:03:18 »
I ground mine down on a wheel
1970 280SL 291H Dark Olive