New to E85. Getting a baseline...

[FattyBoomBatty]

i've got the plx dm 5 as well (pretty sure on the part number), and you saw the gauge in it. There's a little controller box you can hide. You have to wire switched power and ground, and if you want the latched narrowband output, you have to plug that wire in yourself, but it's easy. And the gauge is normal 52mm and very thin, probably less than a centimeter.