I have an 85 GMC truck that i want to re-hook up an ohooga. It has two wires coming out of the horn. I purchased a separate horn button, but dont know where to go from here. Do I need anything else? Where do I hook up, etc? In other words, this is greek to me even though I've restored old cars in the past, just never set up anything other than what was original. Thanks for your help.