If you are changing the warning lamps, no. If you are changing the indicator bulbs as well, than yes. The solid state relays are cheap and adjustable for speed. They only have two terminals. One is to the switch, usually marked E but the other goes to the bulbs and is marked L for "load". The earth terminal is not connected. The correct type of bulb is BAU15S but be careful not to buy those that are too long to fit the Honda fittings.