As gromit says, it is a voltage stabiliser that provides 10v (average, actually switches on and off) for the temperature and fuel gauges.
Reversing lights were optional equipment on Series 2a Landrovers, and were rarely, if ever, fitted until they became mandated by ADRs (during S3 production). A few were retrofitted later, rarely with the factory optional equipment. The reverse light switch is a push switch mounted in a hole on the back upright of the bracket that holds the gear lever ball mount. There may be a hole for it on your bracket, but most likely not.
John


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