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just got my 69 charger on the road, way low readings showed 10-20#, went thru dash, replaced voltage regulator, finally swapped out sending unit and went right to 40-60#. had wrong unit on, one meant for idiot light not gauge, that could be your problem too, similar symptoms. Greg

Guage takes a big bell shaped sender and lite is the little flat sender.
Running a late model - Late model what: All the later small blocks the unit is in the same liocation in the top rear of the block next to the distributor..