I was on the phone a month ago with AEM. I did multiple volt meter testing to the sending unit. It is getting proper power but the original sending unit failed the ohm meter test. So I sent it in and literally just opened this brand new sending unit and installed it and bam it does the same thing.. reads 0 Boost.

The gauge has it's own power lead and ground and the connector plugs directly from gauge to sending unit... no way of messing this up. They even call it their easy plug and play gauge. . .