Just purchased a 1986 Hunter 25.5. The depth gage appears to be the original equipment but it is not working. The name on it is SR Mariner. I want to replace it for next year. What suggestions might any sailor who owns a 25' to 30' boat offer as a good replacement? The wiring is intact and it is live. I am not certain if the SA Mariner was a thru the hull gage or not. Ditto for the compass which also needs to be replace. Both instruments are dash mounted. Thanks much