very very bad
I won one on ebay for less than £20 not long ago.
When I fitted it it didnt work and the seller sent me another one that did. A couple of weeks later the rev counter on that packed up so I changed back to one of my own that flashes off and back on when it feels like it.
I really like them but they are not reliable. You might get one that works perfectly for the next 20 years but its more likely that itll develop a fault sometime or other.
I want another one for my car but sadly the £180 one is for an auto otherwise Id have snapped it up
