Well, I just installed an Autogage tachometer...and it's working great. My question is, the directions say to use a 12V power source from the fuse block, or use an inline fuse. I didn't do either...yet. I was going to go into the fuse block because that seems like a good idea, but I don't have any of the odd shaped plugs that fit into the openings. Where can I get them? Do autoparts stores carry them? I probably won't go back and re-do it all, but I do want to install an in-line fuse. (I tapped into a 12V, ~18 gauge, wire off of the alternator) But, the directions don't say what amp to use. I bought 30's. Will those be good? Too high? Too low? Thanks for any help.