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Tender
Control- large black knob: gas valve
-other unused barb can be used for a steam heater line to warm the water bath

Cab- Large black knob: throttle
-to left of that is the slotted plug/cap tube for oil
-center above the black throttle is the slotted plug/cap to unsrew for water into the boiler

Gas: order from our sponsor Royce along with a filler valve for good price
Until then could use Ronson gas container or find a sporting goods store for 70/30 mix but need a filler valve.
 

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Kevin
The seventh photo is the safety valve. Sometimes it might need to be adjusted but you will have to determine the release point of boiler pressure (blows off) in coordination with the pressure gauge.

Yes, now that you mention the "extra", so that brass connection on the tender is for the hand pump that can be retrofitted into the tender to pump water allowing for extended run when one is stopping to refill gas/water (of course you know you cannot take off the in cab cap to add water when the boiler is hot/underpressure- would result in the old radiator trick).
 
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