what wire connectors

i got my new depth finder installed,i think i done a good job for my first install,but im not real happy with my wire connections.i went to lowes and picked up some straight crimp connectors for 16ga to 22ga,but it didnt seemed to crimp well on the depth finder side,the wire is the smaller wire of the 2.in fact my ground pulled out as i was gettin ready to put cover back on,so i redone it and crimped it as much as i could but im still not realy happy with it.help me out here fellows,what is the BEST connectors for this,i need the name so i can go get em,and i will redo it again,i dont want any problems down the road.