A swim platform is on the list

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I had the mechanic at the marina check the gauges and senders and he confirmed the gauges are bad but the senders are ok. I was having him take a look at the boat in genearal to see if there were any other issues. He did find that the thermostat was stuck open- so that's fixed now. It is much easier to start now - I didn't realize it was bad before.
I am starting to search for replacement gauges, but I don't see exact replacements online anywhere. I am going to call my local dealer tomorrow to see how much the replacements are.
Thanks for your help!