How do I troubleshoot speedo

[tvrgeek]

OK, maybe I'll keep my Smiths gauges. FIxed the clock, fuel should be OK, tach is fine, volts are fine, nes sender should fix temp. Speedo jumps around. It could be the speedo, could be the cable, could be the 90 degree, or even ithe internal gear. What is a reasonable approach to troubleshooting the cause. Is there a usual fault?

[022Dave]

I had my speedo converted to electronic, with a pickup sensor off the driveshaft. An added bonus is that it can be calibrated easily from the drivers seat for accuracy, particularly if you change wheels or tyre combinations.

Dave

[tvrgeek]

Yes, one can go electronic. I have GPS in my B and welded 4 tabs on the diff flange for my cruise control in the Stag, and am trying to find out if there is some way to put a standard pulse generator on a B-35, but as I have fixed the other gauges, I was thinking I could stay stock. Hence, looking for advice rather than just shotgunning the stock components.

[Alacrity]

A dancing speedo is a cable fault 99% of the time.

[StagJonno]

A dancing speedo is a Stag characteristic - part of the fun

[tvrgeek]

A dancing speedo is a cable fault 99% of the time.

Cheapest part. I hate to shotgun, but might just add one to my next order. I can then cut up the old one to mount a pulse generator to a short section.