Hi! I am wanting to retrofit two cooling fans into my 80s chevy truck. Issue is I really want to control the fan speed. I know these fans come from a vehicle that uses a 50 amp fuse or breaker as circuit protection. I would like to be able to use the fans at 60% and 100% of the fan speed. I figure a max of 750 watts is what they will pull. can you all help me create a speed controller? I am good at soldering and am mechanically inclined. this will be used on a 12v-14.5v system Thanks!