Well my I believe Autohelm 4001 unit works well for being a '98 unit. Recently the numbers on the readout have become very difficult to read but it does not affect it's usability.
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Tim
Tampa Bay Carver 355 ACMY Twin Cummins Diesels Sold
You need to see what model course computer it is tied to. The 8001 is a control head for an autopilot. The course computer should be an SPX 10 or something similar.