It looks like the council have removed the plaque for now. In the meantime you can find the location of the final by projecting a point 100 metres away from the posted coordinates at an angle of 218.66 degrees. If you spot it replaced, let me know please.
The Kingsland Tram Disaster
The posted coordinates are at the site of Auckland's deadliest tram disaster more than 100 years ago. Trams had been in operation for just over a year and were considered by New Zealanders at the time as revolutionary - until this time every day transport was limited by the speed of a horse and here were railed vehicles propelled along without horses or steam, using the new-fangled electricity. Electricity was so new that it was used only for street-lighting and trams - by 1909 there were just 195 customers signed up to the council's electricity service.
The people of New Zealand were shocked to wake on Christmas morning to hear the news that 3 people had been killed and dozens injured when the packed No.39 double-decker tram heading for the city had a brake failure and ran backwards down New North Road where it would run into the city-bound No.32 at more or less the site of the posted coordinates.
The accident led to improvements in subsequent tram building in Auckland, Wellington and Christchurch. While there were other fatal accidents in the 50 years and more that trams continued to run in Auckland, most tram historians agree that the Kingsland runaway tram was the worst disaster in the history of trams in Auckland.
To find the cache, look for the small plaque commemorating the site of the disaster and then calculate the final. There are two numbers on the plaque - one with four digits and one with two. Call these two numbers ABCD and EF. The cache is located at:
S 36° 52.A (D+E) (B-A-A)' E 174° 44.B (A+D) (E+D+A)'
Checksum for the coordinates is 32 for south and 42 for east.