First Hummer,
sorry it took so long to get back to you. I think with the OS-4 you don't have to splice any wires, just plug and go.
The D1 should fit, I've seen the Excelon fit. The dash kit comes with the D1.
theadlee- I bought mine from 12 voltswholesale through ebay.
I'm still waiting for the tuner to come, then I will install it.
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