P-
See wire #9 on the schematic on pg 30 of the XP Parts List manual, on the Wiki under "manuals" **see note below
https://c34.org/wikiwp/I don't like "loading up" the key switch, so I re-do a panel I put such things on anything that is made hot by the key -- hot side of gauges, hot side of a switch, etc.
The fuel pump wire is actually redundant -- both the alternator field excite (purple wire) and fuel pump feed are made hot by the key switch. With new harnesses, I run one #14 wire and branch off in the engine compartment. I have also fabbed a sort of dual terminal that plugs into the alt field excite male terminal and branches back to the fuel pump, but the fuel pump wire could be "hard tapped" as well.
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Edit - To prevent failure at panel terminals,] I create a harness bundle and zip-tie it to the back of the panel (typically to 2 gauge brackets and the tach) with zip ties. See Pic.
** As a new owner you need to know the dirty little secret about the engine vs. the boat. The engine as purchased (and it's wiring) is just popped into the boat. Manuals from Universal/Westerbeke are typically NOT personalized to Catalinas. For instance panel schematics shown are typically for a Universal/Westerbeke panel, not a Seaward panel. Note that the key/start/preheat wiring may be different from yours (besides being different from Universal's panels, Seaward itself had different panel wirings.) It's sometimes like a box of chocolates-- for example, the wire color can change from the panel to the harness to the engine (handy!) And colors used have varied from one harness to another.
-k