From looking at the wiring diagram of the MGA I see that it doesn't
have a voltage stabilizer to feed the gas gauge & sender; it depends on
the output voltage (V) of a terminal on the control box. I suppose
that's a nominal 12V but I don't know the delta V. Either MG A or B
that supply V is going to vary a bit from car to car with the B being
better regulated and you have to take into consideration the condition
of the wiring harness, so I agree that each gauge should be calibrated
on the car. Also, I've never seen a gas gauge whose readings I have
ever considered to be exact. I see it more like a guide.
CR
On 4/18/2015 3:17 AM, PaulHunt73 via Mgs wrote:
> Don't expect the gauge to be linear even when recalibrated. I
>
> Incidentally replacement senders vary wildly from the originals and
> even each other. because of that you can't reliably recalibrate the
> gauge using the resistance values given on Barney's site, you can only
> do it in the car with the appropriate tank and sender.
>
> PaulH.
>
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