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Old 03-23-2006, 09:10 AM
Registered User
Join Date: May 2001
Posts: 356
126 tach (RPM guage) assistance please

It was my own doing that caused the RPM guage to stop working on my car. Just not sure "which of the doings" it was, so I would welcome some guidance in trying to bring it back to life.
Last week I felt artistic and decided to pull the instrument panel on my 1987 300SE (126 ,M103) so that I could renew the Dash light Dimmer-hopefully improving the quality of it's light, while at the same time bringing back the bright orange color to the instrument needles that had turned pale yellow with time.
All went well and while waiting for these coats of enamel paint to dry - I decided to rinse the engine bay. Carefully and Gently....
I dried the engine real quick and it fired up immediately and has been preforming well these last several days. The instrument panel went back in without a hitch, after replacing some bulbs and rebuilding the Dimmer - Which in all fairness did not really need rebuilding. Heck, you never know that until you tear it down and open it up.
All the guages work now except the Tach so I know the fuse is good and everything is connected as should be (I believe) in back of the instrument panel. That makes me think I should look elsewhere and look into possible water damage. I was reading through the archives and the CD manual without success, trying to learn what governs the Tach on the M103 ? Is it a relay ? a sensor ? Where might it be located. TIA
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Old 03-23-2006, 12:27 PM
Registered User
Join Date: May 2001
Posts: 356
Fixed !

I win my own Idiot Award.
I pulled the Instrument Cluster again to double check and found I had neglected to plug in the Tach connector.
On the flip side - no (water) damage - what a relief !

Still would like to know how the Tach Tachs.. on the M103
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Old 03-23-2006, 01:26 PM
Strife's Avatar
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Join Date: Apr 2004
Location: KY USA
Posts: 2,238
I did get burned by painting the oil gauge needle on my car. I put the paint on without adequately thinning it, and although it turned out well it went on a bit thick. Testors paint takes quite a long time to completely dry, and my oil pressure gauge would stick to the "0" pin until I hit that first bump in the road, for an entire summer, after which it finally dried. Seeing "0" on the oil pressure gauge while driving is unpleasant, I assure you.
86 560SL
With homebrew first gear start!
85 380SL
Daily Driver Project
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Old 03-24-2006, 02:42 AM
Registered User
Join Date: May 2001
Posts: 356
painting for me turned out to be the easy part - I chose not remove the needles like some people do. Instead I used tin foil which works very well to mask all surfaces you do not want to paint. Drying between layers is a long process - that's how I got to clean the engine...
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