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Roger Basin 04-21-2015 06:52 AM
Tachometer problem
 
I have a Superformance Cobra with 3000 miles and the tachometer stopped working. Can anyone recommend a quick fix?

Tim7139 04-21-2015 07:14 AM
Not without seeing the car, no. It's either a drive gear issue or a guage issue. First thing I'd do is check the drive end at the transmission, could be loose. If not, unscrew it and lightly chuck the cable end in an electric drill and spin it. If the needle moves its the transmission fitting, likely the drive gear. make sure everything is tight first, you can reach up behind the dash and finger tighten the knurled lock ring on the guage .

strictlypersonl 04-21-2015 10:18 AM
I'm not sure where SPF gets their gauges, but you might give Nisonger a call. Your tach may be repairable.

Nisonger Instruments :: the exclusive Smiths U.S. Warranty & Service Center since 1949

Detroit Bill 04-21-2015 11:38 AM
Quote:
Originally Posted by Tim7139 (Post 1345806)
Not without seeing the car, no. It's either a drive gear issue or a guage issue. First thing I'd do is check the drive end at the transmission, could be loose. If not, unscrew it and lightly chuck the cable end in an electric drill and spin it. If the needle moves its the transmission fitting, likely the drive gear. make sure everything is tight first, you can reach up behind the dash and finger tighten the knurled lock ring on the guage .
He said Tachometer not speedo.

Detroit Bill 04-21-2015 11:40 AM
A good place to start would be checking the wires on the back of the Tach, have you done that?

rodneym 04-21-2015 11:56 AM
In my old SPF I had a tach issue that was cause by the center contact in the dizzy being dirty.

Blas to the rescue.

Sailfish 04-21-2015 12:34 PM
I had an issue in my SPF with the tach being erratic. Turned out to be a bad battery to chassis ground (ground wire was just barely attached to the chassis). I cleaned and refastened the ground and the tach immediately worked as it was supposed to.

Tim7139 04-22-2015 07:53 AM
Quote:
Originally Posted by Detroit Bill (Post 1345828)
He said Tachometer not speedo.
DUH, why yes he did.

Detroit Bill 04-22-2015 07:54 AM
Quote:
Originally Posted by Tim7139 (Post 1345922)
DUH, why yes he did.
But we love the enthusiasm with which you jumped in to help!

Detroit Bill 04-22-2015 07:57 AM
Quote:
Originally Posted by Sailfish (Post 1345837)
I had an issue in my SPF with the tach being erratic. Turned out to be a bad battery to chassis ground (ground wire was just barely attached to the chassis). I cleaned and refastened the ground and the tach immediately worked as it was supposed to.
I think when I get my car I am going to make sure that ground is good and possibly add and or check the engine to chassis ground. That is a classic cause for mystery problems. Stand on the gas and the car stumbles.....

Tim7139 04-22-2015 08:16 AM
Quote:
Originally Posted by Detroit Bill (Post 1345923)
But we love the enthusiasm with which you jumped in to help!
Remember, all these Smith's tachs were mechanical, I guess I'm in motorcycle mode, my Triumph's have nice cables off the gearbox.

Mark IV 04-22-2015 08:54 AM
Roger,

Give me a call. We will ship a replacement if needed.


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