Over many years I have owned a 401 403 404 408 411 mk2 411 mk5 412
They all have similar systems . Not one of these cars have ever had the reserve system working. Things may have changes but I discovered that the DB 4 to DB6 used the same system as the 411 and reconditioned units were about 800 pounds so needless to say none of my cars including the three I still own have working reserves.A company called Four Ashes Garage would recondition your unit at great cost if the are still about.
Best of luck Peter Dowdle
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