I installed an under dash tach. Wires are;(Red to electrical source)(white for illumination) (black for grounding)(green to the coil). I have everything hooked up except the battery wire. Question is; I have an accessory spot and a battery spot available on the bottom of the fuse block below#4 and #8, can i use one of these spots with an in-line fuse, and how many amp fuse should i use? Or is their another spot i could hook into without jeopardizing the rest of the cars electrical?