I do exactly the same thing in recreational diving. SPG is easy to see/read, the O-ring will easily break away if needed (and therefore periodcially needs to be replaced).IThe main reason I have an SPG( located on my left side, on a 22" HP hose, with a clip and attached to my BC D ring. The clip is attached to the SPG hose with a large O ring doubled over slid through the clip ring and slid over the SPG hose.
I've not experienced a transmitter failure per se but, I have experienced an intermittent signal loss a couple of times inside wrecks.
I have intermittent signal loss, usually at lower pressures (~700psi), with my transmitter/computer unit. I have had 'failure to sync' experiences on several occassions. I consider my brass and glass SPG to be more reliable. Yes, a digital device is probably more precise than an analog unit. But, also remember that there is a mechanical / analog transducer, between the cylinder gas and the digital board, that converts pressure to a digital signal, and that unit is not necessarily any more reliable, or accurate, than a Bourdon tube.DiveClimbRide:Guages have lower accuracy towards the bottom of the scale. The computer is probably correct.
I love the convenience of wireless air integration. All I have to do is rotate my wrist to read my computer display. I do not consider either my analog pressure gauge or my transmitter/computer unit to be absoltuely fail safe. Personally, I am more comfortable with the reliability of the SPG.