There is no timed metering of the ether. It is metered thru fixed ports/nozzles to deliver X volume per second sprayed, but when the ether sense switch is below 100F(coolant temp), the ether sprays as long as the dash switch is depressed/tank has ether in it.... real simple circuit. CB22 to dash sw, to coolant temp sw, to solenoid, to ground...
The start procedure in the -10 manual(page 2-136) says after you start cranking, cycle the ether switch 3 seconds on, 2 seconds off till the engine starts and runs reliably without it...
glow plugs are usually an IDI thing. DI engines use intake air heaters.
as mentioned the coolant heater is the real ticket, but when you don’t have power... or as mentioned light a fire under it