Re: 1991 gauge cluster question
I removed the tailshaft from a 90-91 blazer t-case, as well as the toning ring and wires that lead up to the DRAC unit. Then I reinstalled on my 89 (removed cable driven unit) and then re-pinned my instrument cluster. I have a detailed write-up on the swap and it worked out great! From the DRAC, you can send the pulse to the EGM for fuel injection, abs, etc.......
There was even a pin difference from the 89 to the 90-91 era so your's will need to be changed.
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- Jeff
89' K5 Blazer, 2.5" lift, 35" tires 
04' GMC Yukon XL, 3/4 ton, 8.1L
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