Barry-
I have a (ONE) extra counter that Mike gave me back when the supply train was still open.
I'll send it to you if you PM your address to me.
The windlass has a magnet embedded in the gypsy and a reed switch mounted somewhere on the non-rotating body of the windlass.
When the magnet passes the reed switch, the contacts close, making it possible to count the revolutions, which are about equivalent to 1 foot of rode.
Mount the counter in a Radio Shack project box. Wire the windlass reed switch, the counter, and the 12 volt positive lead from the down direction lead on the windlass control unit, all in series with a suitable ground. Add a fuse in the circuit to protect it from overload. A 1 amp fuse should be sufficient.
When the power is turned on from the up/down switch in the down direction, power is supplied to the counter circuit. Each revolution of the gypsy causes the magnet to close the reed switch, allowing power to flow in the circuit, and the counter to count one unit (foot).
There's one more step: The counter will need to be reset before each lowering. The counter's reset button on the front doesn't work but there are two leads (pins) in the back that, when connected, will re-set (zero) the counter. Mount a momentary push-button switch at the far end of the project box and connect it to these leads. Pushing it down will zero the counter.
If this isn't clear, I'll draw you a diagram when I send you the counter.
Here's what it looks like in my installation before I had to add the reset button. Your design may be different.
Joe. :teeth :thup