I did not purchase the HPOP Gauge Wiring Harness, can I still install this gauge on my 7.3L Ford?

Yes, you can still install the gauge just have to tap into the signal wire from your stock sensor. For trucks 94-96 and 99-03 you will use the Dark Blue/Lt Green wire. For the 1997 model 7.3L you will use the Lt Blue/Red wire.

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