just got this jet ski,1st one, don't really know anything about em. its a 750 2 stroke dual carb. guy i bought it from said 2 cylce oil goes in oil tank and regular gas in gas tank, no mixing. is that how i do it. when i got it it was full and i took it out a couple times. runs pretty good. noticed the trim tries to move but won't, any suggestions. also about halfway through the 1st ride all the gauges and lights worked but quit sometime, still ran good but no idea how much gas i had. came home and checked wires and fuse,everything seemed good. second time i was going out, i started up for a sec, gauges and lights worked,thought ok,took back out and everything still worked until about halfway through riding,no lights,no gauges,but still ran good. any idea's on what to check or do. thanks for any help