No alarms on PT26 just the gauges.
We do use the oil pressure safety switch that also shuts off the fuel pump.
Over time I have learned all the noises and listen for anything new... Nothing like a new noise followed by what the heck was that!
An alarm system would be nice to have though, I have caught myself saying "what was I doing"
I am adding this to the - things I want to work on over summer list