1990s campion mercruiser 5.7

[Warhammer]

Cuious as to peoples thoughts as to why my guages are jumping around in the driveway while idling. My battery posts are clean and engine block as well.

Lee

 

[fastjeff]

Bad grounds.

Jeff

 

[Warhammer]

On the guages themselves?

 

[johnnygjr]

The grounds are pig tailed on a singe run,check at the first gauge to where it is grounded,possible busbar