The oil pressure switch on the 093 is attached to the top of the turbo with the oil feed. A nice place to put it if you're worried about turbo oil. When I put in a gauge I just replaced the stock sender, I have ATS 088. Dash gauge becomes useless. You could also google ford oil pressure sender fix and turn your dash gauge into a variable gauge instead of a glorified idiot light. You change from a switch to a sender and bypass a resistor on the back of the cluster.
The only problem with replacing the stock sending unit with the one from the new gauge (aside from the non-functioning stock gauge) is that it'll throw a 'check engine' light. Not that that means much in our trucks, but I found it annoying. Instead, I plumbed the new sending unit to the same location as the stock unit with a 'T' fitting. But really, I need to move one of the two units to another port because it's a TIGHT fit for everything with the Banks kit installed (mounted on the turbo). If Autometer or someone offered a sending unit that wasn't so damn big, it'd be fine. Haven't found one yet, though.
OBS pillar pods will fit a bricknose with trimming. I have a 3-gauge pod from Autometer in my bricknose, and it fits fine. On the pillar, I have Boost, EGT, and coolant temp. I have the oil pressure gauge mounted under the ashtray. At the time I bought the pod, I was not planning on running another gauge, otherwise I probably would've purchased the Glow-shift 4 gauge pod to start with.
Mike