2005 challenger 1800 gauges "squirrely"

[DeanBrantley]

The analog gauges on my challenger do not read correctly, they move around at random, speedo, tach and even the fuel gauge. Every once in awhile my idiot lights also light up, beep a lot so I shut down and restart then their fine. I put in a new engine but the problem was there before. I have cleaned every electrical contact in the engine compartment to no avail. Any help would be appreciated

 

[JPass]

Check your gauge grounds and wiring for loose connections or corrosion.

 

[DeanBrantley]

When I had the engine out I soaked all the connectors in alumiprep (mild acid for aluminum used a lot on aircraft) until they were bright and shiny, even used a little wet sand where I could. Still might have missed some I will check, thanks.

 

[DeanBrantley]

Nope, all grounds good. Now it starts beeping while running, no idiot lights then sometimes chk eng comes on. Runs fine the whole time but I come to a stop anyways, shut down, then cranks right up and goes.