vivaro 2005, abs light on , no speedo, glow plug light on, no communication from abs unit.

Hello can anyone help?
i have a vivaro 2005 with a few problems.
the abs light is on, and i have no speedo.
I've checked the 5 amp fuse on the passenger side, also changed the abs sensor on the passenger sensor form the front nearside.
I'm at a bit off a loss of what to do, there appears to be no communication from the abs unit from a diagnostic tool.
Also sometimes has no power from 1800-2000 rpm, then it kicks in, said egr fault , but checked ok.
Do i have the dreaded wiring issues?
is...

vivaro 2005, abs light on , no speedo, glow plug light on, no communication from abs unit.