I have a 04 tracker pro team 185 with a mercury elpto 90 and cant the tach to work. I've changed the regulator, replaced the connectors, checked all wiring, turned the engine selector switch on the back to clean contacts and still nothing. The tach moves while cranking but falls to 0 after it starts. Even borrowed my buddies tach off his 08 tracker pro 175 with a elpto 50 and his works but it reads 5500 rpms idling. My tach on his boat just does the same thing it does on mine, moves up until it fires off and goes back to 0. Anyone else have a similar problem and figure it out? Thanks