DONT MISUNDERSTAND . and do anything silly, but if you want to test the systems and light it off IF YOU ARE SURE you have positive oil pressure and have a bad switch , just wire around it with a shunt , provide the signal, it will likely fire up and if so your on two step 2 , EMERGENCY SHUT DOWN. make sure your shut down switch is good with a multi meter prior to start .If its running at loaded speed it is noisy !! I cant tell you how noisey but LOUD and it whines , you will say" DAMMM that's loud". when you initiate shut down it is like and instantanous lack of fuel , It will suddenly go PHEWWWWW as it rolls down in rpm you will hear an instant spool down begin, you should observe a decrease in operational gauged indications and see a little puff of fuel from the combustion drain. IF YOU DONT be on alert for a post shut down fire!!! , relax, the combustion cann runs hotter during ops than static with a cann fire ,BUT when it has no louvred cooling air , it can get hot, all you have to do is motor it over with no fuel , don't excede starter duty cycle unless your in deep kimchee, This provides a modicum of combustion cann cooling air and with the fuel off Disperses any flame or RAW fuel you may have stagnant in the cann. If you notice a rise in monitored EGT ( indicated pyrometer temp) small and slow to gain its likely EGT soak back, meaning the previously air cooled combustor has lost its source of cooling. and the inherient heat now rises incrementally as time passes until it peaks and slowly degrades. A combustion chamber fire results in a fast spike in Egt immediatly after shut down , some times its accompanied by a very Loud BOOM. and a possible flash of fire up the exhaust duct on shut down its almost always a malfunctioning Combustion drain or bad control/leaking fuel nozzle. Good luck , post some pics, My son is back in TX and will look for the guide!