Trying to help a friend with a 10 year old ST60. Wind angle is correct but wind speed is about 1/2 of actual. Start with connections? Sending unit? Anyone have the voltage readings? Thanks

If anyone has a sun cover for the old ST60 surface mount Tridata Instrument, I sure would like to buy it. They are out of production and can't even find one with Google search. For reference it is on a 1995 H336. Please PM me if there is one out there. Thanks John