Rectifier - https://www.amazon.com/gp/aw/d/B07L94NTSB?psc=1&ref=ppx_pop_mob_b_asin_image

Key switch and voltmeter - https://www.amazon.com/gp/aw/d/B082J1DSQH?psc=1&ref=ppx_pop_mob_b_asin_image

I do have a battery, the full system build is in another one of my posts.