Minimum requirements for testing TBI system on engine

[kilohertz]

Hi guys,

Getting ready to test fire the '91 1227747 TBI system on my '49 Ford flathead and am wondering what are the absolute minimum requirements for sensors and connections to get it to fire just in open loop mode? Besides the obvious fuel pump and distributor.

From what I have researched, I think I'll need the coolant sensor connected but doesn't have to be in the water stream, TPS, IAC, MAP, don't need an oil pressure switch, just the fuel pump relay, no ESC or knock sensor, read somewhere that the ECM pin needs to be tied to 5V reference for this?? Can someone please confirm if this is true and what pin it gets tied to? Probably don't need the O2 right away either...

I think that's it, let me know if I am on the right track please and thanks.

Cheers

PS one other Q, could someone please tell me what the ALDL signal voltage is out of the ECM, is it pulsed 5V or 12V? I'm building my own cable and thought I might be able to use a cool little RS-232 to 485 adapter I have. thx