2000 29.5' twin 350 Mag Mpi's

Ok so this boat is new to me and I'm trying to get all the little things worked out on it. What temp should my dash gauges be showing, keeping in mind I have Mag Mpi's. I just changed the thermostats and impellers because it runs 180-190 on both engines consistently even though the parts counter said the thermostats for the boat were 160's, and after changing it still runs in that range.

Also I'm have a hard start problem. Friend said it sounds like vapor locking due to the ethanol gas, said he had the same issue in a previous boat with a 305 mpi engine. Happens more so when the boat is on an incline, like when its pulled up at the beach. Fires off, stutters and dies. Once I get it going everything is fine. I'm thinking fuel pump issue, so can someone tell me where the pump is located at on this boat, and also has anyone else had a similar issue.

Thanks.