I'm getting a 460w HP server power supply ebay listing picture says model: DPS-460MB A and RMN is HSTNS-PD28 anyone know what pins i need to bridge? most things im finding are for the 750w and up versions

Looks like a common slot server power supply that works for HP proliant servers. I have converted quite a few supplies for those servers. The pins should be the same. The pins are 33 and 36, but looking at it they will be pin 1 and 4. I use a 330 ohm resistor. This essentially tricks the power supply into thinking it is plugged into a server.

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No harm will be caused by placing the jumper on various pin outs until you find the right pins, but I would start with pins 1 and 4 as well

All of these HP power supplies are designed for HP(E) Common Slot, which means they all have the same pin outs.