ok need a few idea on where to start with this. my tach has been messing up for about 5 months or so.. what i use to do was when i got near red line it would flip over... meaning on the bottom part of the little stop pin... only way to get it back off was get near redline in 2nd or 1ft and it would pop back in place.. well now the dam think is just not working half the time.. ill start my car and the tach will not work.. ok heres the odd part... if i reset my techtomater.. the left side :stickpoke .. it will start to work... its odd as can be...

Any idea? or anyone have this happen to them