disable security system

i know this aint the forum for this, but i need help, im a chevy man.. im trying to diable the security alarm on a 92 chrysler 5th ave. any help? im ready to put a fuel pump on this thing, and want to make sure. the guy broke down infront of my house, and i live in the country, give him a ride back to town, older guy not much money.he has the money for a pump.. im just worried about the security system, he says its stoped the car before.. any help? thanks