So, I actuallly dont think I have enough information about these LED's but perhaps one of the above who actually knows about 921 replacement bulbs(car, truck rv interior LED's and backup lights) https://www.amazon.com/gp/product/B0761TSXF4/?tag=tdpri-20 I need 11 of these wired in parallel. A resistor has to be placed between each one on the positive leg(anode) the negative gets wired to a fret and also to the bridge. When one depresses the string, bulb lights up. I suspect I don't know 3 things 1) the value of a resistor necessary to do the job 2) power supply. what kind how much, how big, 3) how much current is this Actually this part does scare me quite a bit. I dont want to electrocute myself. I know voltage is DC 12v I know Watts is 3 watts Ohm's says Amps should be .4 BUT, elsewhere in the customer reviews a guy says its 1.3ADC because he has specific product knowledge the seller doesnt list. I contacted the seller, crickets. yes I can return it but I'd like to use these if I could. Anyone have any ideas? I suspect im sorta on the right track. Its always better to ask though.