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MG MGB GT V8 Factory Originals Technical - More on speedos (sorry!)

Hi All,

I know I am flogging this topic to death but...

Was the Manual SD1 series 1 speedo the same for all cars in the range - 2000 up to 3500? I can only find the single type listed by Rimmer bros.

Also (OT) if my indicator tell tales both flash weakly when I indicate (the external lights are all fine now) but then rectify when I bang the steering column- upwards (72 car, metal dash). Does that mean bad earthing from the dash to the car body.

Thanks,

Liam.
Liam H

My stock MG speedo is acurate using the LT77 gear box and a 3.07:1 rear end. The cables even work. Why would you want to mess with the SD1 speedo. The MG unit works fine.
M Mallaby

Hi M,

Mine says 22 when I know I'm doing 30. It must be the 3.3:1 back end I am using.

I an now thinking about finding a closer speedo, and pasting a scan of the dial across.

Liam
Liam H

I had the cable end changed on my LT77 speedo cable so I could mate it to a GM Hall Effect Sensor. I attached that to a VDO electronic speedo, calibrated it on a known mile, and was up and running in no time.

Food for thought...
Justin

MGC speedo should work better. MGC had 3.31:1 I think.
M Mallaby

Yes, it's a C back axle, but the speedo is fixed to the gearbox.

The thing is, I know of two places that can recallibrate for me, but the thought of anyone seeing me push the car along for 6 revolutions of the wheel while I count the speedo cable turns and thinking my pride and joy has broken down is too much to bear.

Regards, Liam
Liam H

This thread was discussed between 27/06/2007 and 07/07/2007

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