Dan, on the 1994-95 3.4 DOHC OBD1 PCM, the low oil level switch has two terminals. One connects to ground. The other connects to PCM terminal D19.
The PCM has an output to control a dash mounted low oil level warning light coming from pin A4. The PCM grounds this circuit to turn on the light, which means the other terminal of the light needs to get switched 12v + power (hot with key in run and crank).
If you have a 1991-93 3.4 DOHC PCM, there is no low oil level sensor/switch connection to that PCM.
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