This is an original optional accessory part for the MGA. Bump that bat handle 10 degrees in any direction and this switch makes a ground contact. This was used with a relay and a small wiring sub harness to allow the MGA headlights to "flash to pass". For factory installation the dash was commonly drilled to mount this switch just above the turn signal switch. For aftermarket owner or dealer installation it could have been located just about anywhere in the dash, but commonly a finger's reach from the steering wheel. The related relay may have been screwed to the firewall or high on the kick panel behind the dash. The wiring sub-harness ran between the relay and the original kick operated dipper switch, with one additional wire running to the manual switch to ground the relay coil for operation.

There was at the time a toggle switch with similar appearance which would be used for a driving lamp when fog lamp and driving lamp were installed at the same time. The same type toggle switch could also be used for a back up lamp or a rear fog lamp when required by local country regulation.