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Registered
Join Date: Nov 2001
Location: Austin, TX
Posts: 1,417
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"Sticky" tachometer
Any advice on a tach needle that sticks???
I can get the needle to drop by tapping the glass repeatedly. When it is loose, it seems to read very low compared to where I think the RPMs are. Anyone know a good repair process for this part? |
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03-03-2002, 04:07 PM
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Registered
Join Date: Nov 2001
Location: Santa Ana, CA
Posts: 220
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I had the same problem on my '66. It only stuck on cold winter mornings. As soon as the car got warmed up, say 10 minutes, all was well. I never had the problem in the spring, summer or fall out here in California. I suppose that is as good as no answer, though. Have it rebuilt.
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Various Porsche's |
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03-11-2002, 08:31 AM
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Registered
Join Date: Dec 1969
Location: Asheville, NC - Antarctica too
Posts: 162
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Sticky Tach
I'll take a stab at this one...
If it's anything like mid-60's VDO's on old BMW motorcycles (which it is in fact), try lubing the cable. If that doesn't work, I'd send it out to a good VDO shop for a refurb...Palo Alto Speedo did a good job on my clock (converted to quartz but looks stock). |
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03-11-2002, 04:59 PM
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Registered
Join Date: Nov 2001
Location: Austin, TX
Posts: 1,417
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The Tach in a 912 is electronic so no cable....
Here's a thought, tell me what you folks can from looking at your cars. Back at the coil, the Tach picks up its signal. My car has the wire to the tach on one side along with a distributor gnd wire and a +12V wire on the other side, thats it. I had the tach apart and the needle isn't binding and floats freely- sits on zero out of the car. Is it possible its source/signal related and not the instrument? It worked when I got the car in October and not now, so either I screwed it up while cleaning up the rats nest wiring or the guage failed. Any thoughts??? Hate to send it in ($$$) if its something dumb on my end.... Best, Morrie |
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03-11-2002, 05:27 PM
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