Stumped an need help on electronic speedo & 700r4

[jcaillouette]

I've got a 1986 c10 that's carbureted and I recently had a 700r4 out of an 89' Chevy truck and it has electronic speed sensor instead of cable, so I found an instrument cluster out of a 90' suburban with an electronic speedo but now I'm not sure how to get it to work since they say it needs a DRAC but with my truck being carbureted it dont have a PCM so how can I get the electronic speedo to work?
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