Mine are original - fitted approx 48 years ago. I havent had any problems with the central drive computer apart from occasional electrical surges resulting in unexplainable actions. Mechanically they have faired pretty well. It is noticeable in colder and inclement weather a fair sprinkling of a well known scottish lubricant will ease any stiffness in moving parts thereby facilitating efficient operation. Interestingly enough i have experimented with said lubricant in fairer weather as well, purely in pursuit of objectivity, and there is a certain point of lubrication where all mechanical movement is disjointed. All filling instructions should be strictly observed
mick
I must admit I prefer this style indicator, but once or twice when I have used the Scots lubricant I tend to fall off!