08-07-2020, 02:03 PM
Like many other A7 owners I have spent many hours in the garage, finishing jobs that never got done.
One of those was to see if the petrol gauge could be persuaded to work.
A Morris 1000 sender unit replaced the original as the Mazak body had crumbled.
The instrument was tested but did not work so I searched the web and found this useful site.
MGA cars
There are several pages with details on how to dismantle rebuild and calibrate the gauge and sender unit.
Mine did not work because the coils had been rotated so the magnets did not work correctly, their position is critical to the working of the gauge.
The tricky bit is not breaking the 0.004" copper wire on the coils!
After several days of testing and calibrating I have a gauge that shows about 1 Gallon = Quarter and 2 = Half full
anything above that is extravagant. Whilst driving the gauge is rather indecisive to say the least, but is still a better result than showing empty all the time. I will keep my home made dip stick as reassurance for a while.
Roger
One of those was to see if the petrol gauge could be persuaded to work.
A Morris 1000 sender unit replaced the original as the Mazak body had crumbled.
The instrument was tested but did not work so I searched the web and found this useful site.
MGA cars
There are several pages with details on how to dismantle rebuild and calibrate the gauge and sender unit.
Mine did not work because the coils had been rotated so the magnets did not work correctly, their position is critical to the working of the gauge.
The tricky bit is not breaking the 0.004" copper wire on the coils!
After several days of testing and calibrating I have a gauge that shows about 1 Gallon = Quarter and 2 = Half full
anything above that is extravagant. Whilst driving the gauge is rather indecisive to say the least, but is still a better result than showing empty all the time. I will keep my home made dip stick as reassurance for a while.
Roger
Location:- Haverfordwest, Pembrokeshire.