This Resistor Is An Easy Alternative To Installing An LED Indicator Relay & Is Simply Connected In Line To The Indicator Creating The Correct Indicator Flash Rate Without Needing To Replace The Original Relay.  Each Indicator Requires One Resistor & So If You Have A Pair Of Indicators You Need Two Of These, If You Have Two Pairs Of Indicators Then You Need Four Of Them (See My Other Listing To Buy A Pair Or More).