Speedo / tach repair - Alfa Romeo Bulletin Board & Forums

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Old 03-21-2004, 08:33 AM
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Speedo / tach repair

Mine are all messed up. The tach seems to run very 'high'. I have a posi rear end, I think in 5th gear my speed should be double, if so it has me doing 70 alot. I bought a cheapo 'untested' of Ebay that also seems shot - the turn mechanism on the back is sticky.

How can I test the cables?

Hey - John S. - Do I need a functional tach to setup my Spica?

MY Speedo worked, but also seemed high, then would intermittently get 'stuck' or start flying all over until it finally one day quit altogether.

Anybody know where original speedos can get repaired, and do they kill you $$? I found a crazy site that said how to do it yourself, but the Alfa 140 mph speedos weren't covered.
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Old 03-21-2004, 09:42 AM
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JC - Have you checked you tach and speedo cables? Erratic needles are usually an indication of either cables that are unravelling, or need lubrication. Also, did you have someone follow you with another car with a known good speedometer to compare readings?

When you have you instruments out, pull out the center drive cable and inspect it. It could be also that the casing is damaged or kinked causing the inner cable to bind when it tries to turn.

As far as setting up your new fuel injection pump, it's best to have a tach. I use an electronic automotive analyzer instead of the car's tach. It's useful for seeing exactly what the idle speed is and also important for setting the mixture, if you don't have a exhaust analyzer (not many people do). Looking for 600-900 rpm at idle and for setting the mixture, you'll set the engine speed at a constant 2500 rpm, then adjust the mixture for peak rpm. An electronic instrument is more accurate and sensitive to small rpm changes that the car's tach.
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Last edited by Roadtrip; 03-21-2004 at 09:49 AM.
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Old 03-21-2004, 09:55 AM
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I think the first thing to do would be to confirm the tach's accuracy (or lack thereof) by comparing it's readings thru the rev range with an electronic tach of known accuracy.
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Old 03-21-2004, 10:48 AM
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Where does one aquire an electronic tach? Auto Zone?

Thanks
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Old 03-21-2004, 11:17 AM
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They're usually sold under "Engine Analyzers". They're multifunction and measure volts, amps, rpm, dwell, ohms, etc and are useful for testing points, alternators, tuneups, batteries, etc. They're regularly available on ebay pretty cheap. Since you have a points ignition, you should have a dwell meter. New, Walmart (ugh, wretch) or other discount automotive sections may have them as well as the automotive specialty discounters.

This looks like it could turn out to be a very good price on an analyzer and an inductive timing light, which is very very useful in determining ignition problems:

http://cgi.ebay.com/ebaymotors/ws/eB...tem=2468293889
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Last edited by Roadtrip; 03-21-2004 at 11:22 AM.
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Old 03-21-2004, 02:08 PM
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There's a place called Palo Alto Speedometer that has been recommended to me.

I asked them for a quote on a speedo once, and they estimated $180, but can't give you a firm number unless you send it in. You are probably better off getting replacements from ebay unless there is something special about yours.
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Old 03-21-2004, 08:33 PM
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Just to get this in the info queue....

I am a satisfied customer of North Hollywood Speedo in (Guess where?) North Hollywood, Ca. They refurbished my '79 Jaeger speedo. It failed in the same way 9 mos. or so later and they honored a 1 yr. warrantee. It's still working just fine, 2.5 yrs after they had it the second time.

http://www.nhspeedometer.com/

As I recall, cost was between $130-$150 in late 2000, plus shipping, with a 2-3 wk turnaround then.

Std disclaimer: no association with vendor except as one-time and satisfied customer.

Michael
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Old 03-22-2004, 12:40 AM
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Here is an ebay speed and tach from a 78, both for sale by the same guy:

http://cgi.ebay.com/ebaymotors/ws/eB...tem=2468148505

http://cgi.ebay.com/ebaymotors/ws/eB...tem=2468261011


Best Regards,
John M
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1984 AR Spider Veloce............the second & gone to the parts bin....Rosso
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