My tachometer wasn't working when I took MB for a motor this afternoon. No reading at all. It comes off the alternator and the charging circuit was working fine.
I pulled it out and played with the connectors and when I started up it gave a reading but very low and once it got to a reading of about 1000rpm (engine was doing about 2000) it wouldn't read any higher. Over about a minute or two it slowly dropped to zero.
It was working ok last week but has occasionally played up in the past but a gentle shake usually fixed it.
Any ideas? I hate electrics!