On my 3 mowers I have hour meters. On my 2 Walkbehinds I have Sendec (I think thats the name). On my Chopper I have a Tiny Tach. Here's the problem. The 2 Sendec's both died within a year. The Tiny Tach lasted about 18 months. Now all 3 are dead. I have these mowers on the open trailer when it rains sometimes. Is it just some water getting in the electronics? Any solutions so I don't have to buy $120 worth of hour meters every 6 months?