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OFF the BENCH, CAMO 🙄 There is not a lot of workable option IMO and the little I understand 🤔 All things being said factory M998, dash wiring is NOT some M1165 special ECV harness. I think 🤔 the fishing for wire numbers and looking for the letters is throwing a wrench into it. ADD the fact...

You forgot to put the smiley face :) ! Starts out dim lights. I see the speedo in the dash. My mistake assuming the M1165, ECV didn't come with a fast speedo. OP didn't say, I am trying to install a speedo from the get go. It's all good, we all play along 🏈 kicking the ball. Dim lights...

How did we go from Speedometer to Tachometer ? Oh look... Some butterflies. I need a compass to follow along, CAMO

ME stayed after school... CAMO Found the drawing, Now I know why they call it a gauge cluster, CAMO PAGE 677 https://www.hummersurplusparts.com/wp-content/uploads/2015/05/M1151A1-M1165A1-TB-9-2320-335-13-p.pdf

Why are we chasing the 27 wires? I too behind the dash. 40 x wires are to the two dash lamps and down to the shifter led. HI-LO voltage depending on load and dimmer position from the light switch. 27 x feeds all the gauges, from the RUN breaker. Battery voltage when in RUN. 24-28 Don't...