I wanted to install some aftermarket gauges since my temp and oil pressure dont work in the dash. I picked up a set of 3 from the local parts store, oil pressure works, temp works, volt meter works, but 40 wont start. Is this because I disconnected the amp meter? I am assuming so? Since I hooked it back up and starts like nothing happened. Can I bypass the amp meter some how? Is it necessary to have an amp meter? Will a volt meter be sufficient? I did a lot of researching on here and couldn't find anything pertaining to my situation. Thanks.