2005 mustang factory subs

I put in a aftermarket amp to connect these subs to, and at the amp I have 1 ohm is there a way I can wire to have 2 ohms at the amp

the subs are 1.2 ohm per voice coil, they are dual voice coil subs

the way I have them wired is on one sub I went (+) to (+) to amp and then (-) to (-) to amp

how can I make it 2ohm load at the amp

There are two factory subs in this car, one in each door, and they are both 1.2ohm dual voice coil

The wiring you described is parallel, so you wired the coils together in parallel.  If you measured the result with the speaker unhooked from the amp, and your meter was adjusted for its own internal resistance, then you measured the DCR of the combined coils correctly.  Meaning, if that is the case, then each of the coils is a 6 ohm impedance coil.

The impedance is higher than the DCR reading you get with a meter.  And the reading would be in error if the sub was connected to a power source.  And...with a parallel connection you know that each coil is of a higher value than your combined reading, not a lower value.

6 ohm paralleled with 6 ohms = 3 ohms, and we are talking about impedance, not DCR.  If you measure a 3 ohm load with a meter you should read about 2.4 ohms (impedance / 1.25 = DCR).

Here are your wiring options.  You can buy a more powerful amp and run these at 6 ohms, or take a gamble on overheating the amp with a 1.5 ohm load.  And be sure you know what the power rating for those subs is.  How much factory power did these subs get?