Plug and play with no need for anything but connectors (no resistors in-line). Check your loom - my '95 model uses male bullet connectors with female Lucas-type nodes (not the Econoseal connectors of later Caterhams, or the contemporary connectors in the excellent JAL video). But the principle is the same - two male bullets crimped-on, and two four-way female nodes directly connected into the supply/return to the rear off-side rear light unit - black-to-black; red-to-green/purple. Job done. Super bright, quite directional, aesthetically pleasing, with a red lens and tear-drop body. Better price than Caterham parts too!