Fuses - starter circuit

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Safari36
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Joined: 3/27/20
Posts: 11
Fuses - starter circuit

I'm upgrading from an Amp guage to a Volt guage on the engine panel and jumping the alternator to the starter lug positive so the current goes from there back to charge the battery.

Also installing a heavy guage solenoid in the plug circuit so the amps go directly from the starter lug positive to the plugs when the plug switch is held in.

My question is, for these two cirucits, how do you I know what my fusing sizes should look like? In the existing wiring, there were no inline fuses. I'm considering installing BLUE SEA SYSTEM MIDI/AMI fusinng system. 

Mark
Safari - 1984 36' Catalina Mk1