SELECT First(Date) AS [Date 1], First(Running Amps for Pump 1) AS [Amp 1],
Last(Date) AS [Date 2], Last(Running Amps for Pump1) AS [Amp 2],
iif([Date 1] < [Date 2], Last(val(Running Amps for Pump 1))-First(val(Running Amps for Pump 1)), First(val(Running Amps for Pump 1))-Last(val(Running Amps...