In order to run two of the FASS HK-1001 ELECTRIC HEATERS you will need to purchase the following:
1). FASS HK-1001 ELECTRIC HEATER KIT
2). FASS32283 (Heater Probe Only)
From there you can splice in the second heater into the original wiring harness.
If you would like to purchase the FASS32283 you will have to contact our sales department by phone (888-343-7354, Extension 1).