I have a 16 silverado with a 320 mechman and i use this - https://customelectricservice.com/products/gm-slingshot-voltage-controller-w-battery-light-delete?pr_prod_strat=copurchase&pr_rec_pid=4654381531210&pr_ref_pid=3724666699850&pr_seq=uniform It works great so far, had it 3 months now.