It sounds like OP has the conversion rally gauges - they are specifically engineered to work with the regular instrument cluster harness (non-rally).
From OPG: “The conversion assembly includes a special printed circuit board that directly plugs into the factory warning light dash harness with no modifications necessary.” https://www.opgi.com/gauges-accessor...hoCWs0QAvD_BwE
I have them on my 69 and everything works minus the accuracy of oil pressure and coolant temperature. So I read temperature off the Sniper EFI panel and added fuel and oil pressure gauges in space for clock.
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Will Rivera
'69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears
‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears
'64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears (Traded)
'69 LeMans Vert, 350, #47 heads: Non-running project
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