From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Wiring diagram for the tank instrument and back of the meter.
| Identifier | ExFiles\Box 90a\4\ Scan170 | |
| Date | 11th May 1936 guessed | |
| BACK OF METER. TANK INSTRUMENT. T B+ CONNECT TO COIL TERMINAL ON IGNITION SWITCH. P.T.O. | ||