GOOD NEWS. . . . The PICTURE UPLOAD FUNCTION IS WORKING !!! The tech folks at the parent company have been able to remedy the issue. You can upload pictures once again. Thank you for your patience.
Could use a serial number to make sure, but the Magnum doesn't have trim senders. The later version called the HP assembly used a single 3 wire trim and switch. It was used with digital gauges.
Mine is the HP and I have the single sender and also installed the Digital to Analog Merc converter, but it still doesn't work.
well poking around seems there are knurled press inserts- unfortunately just not for the 5/8 in marine stainless.. that would have been a real easy conversion! Hole is a few fractions less than 7/8..