69 C10 with 2011 LS3

[GbobC10]

Hi Folks,
So I am new to the forum, and looking for help on this project. I have a 69 C10 LWB. It now has a 2011 5.3L and 4L60E trans. The swap is in and drivable. My issue is the stock ignition switch. I have a stock switch in the dash. My ECU needs 12v in the run AND start position on the switch. My switch breaks power from ignition and accessory while engaging the starter solenoid. This kills the ECU. I have been hot wiring the ECU to drive the thing. Stock ECU I think it is an E38. Trans controller is from TCI. This seems like something that must have been worked out before me, how did you do it? Is there a different key switch that doesn't break power? A jumper wire to add someplace?
Looking forward to the solution. Thanks in advance,
Gary G