irishflies
Seaman
- Joined
- Jul 30, 2005
- Messages
- 50
I own a 1998 150 6 cyl oil inj. merc. My tach just started to work intermitently. It jumps all over the rpm range. This occurs at any throttle position. Is this a problem with the gauge or the sending unit? How can I test the system? Thanks for the replies in advance.