i saw a few just like u mentioned, 0-10bar pressure meter around rm25 from hydraulics & pneumatics shop. but definitely no EL backlight or control unit 2 hehehewhy so much hassle???
go get industrial pressure gauge just like those on air-compressor unit....good for 4 bar or above.....mostly mechanical type...but electronic side sure also got....but not to mention with a lot of agong paper..