I'm at work right now and can't see the pics (government proxy server blocks out most image hosting sites), but I wouldn't recommend having anything hanging down from the bottom of the dash on the outward side of the steering column.
My first car was an '82 Mustang and the electric fan relay went bad (or the temp sensor, or something... not entirely sure), so I hot wired the fan to a switch and placed it hanging down on the bottom of the dashboard outward side of the steering column. Seemed like a good idea at the time - I just turned on the fan when the temp started climbing (usually in traffic or idling) and shut it off when I shut down the car. But then one day as I was hopping out of the car, I whacked the toggle switch with my foot and broke off the plastic bit, leaving the thin metal shaft exposed. Didn't think much about that until a few days later: I was getting in or out and raked my shin across the exposed metal shaft, which of course was a nice cut that stung for days - still have a nice scar from that to this day. After that, I opened the hole up properly and installed an illuminated rocker switch, which lit up when I turned on the fan. After leaving the switch on and killing my battery one day, I rewired to a keyed power source.
I suspect that's probably also the same reason why so many factory defroster and 'vert top switches are snapped off (people not paying attention getting in and out and hitting that area with their legs or feet).
What about putting a small simple red LED above the oil pressure and temp gauges in the center gauge cluster. Get some of the smaller ones and unless you're really paying attention, would barely notice them unless they're lit. (it sounds like you might not have a center gauge cluster though, considering you have an oil pressure gauge hanging under the dash already - again, can't see the pics)