I have installed the auto timer in a 91 sentra se-r, I followed the instalation instructions , the timer and volt meter are working properly. But the O2 senor and A/f are not working properly,I have the O2 wires ran into the ecu where the instructions say to splice the white and black wires the A/F flashes and that is it, it doesnt read anything.The O2 voltage is reading 4.92at idle any help appreciated

Make sure you spliced into the correct wire on the ECU. It can be confusing trying to figure out which way they actually have the ECU printed on the page. Your a/f will display - - - untill the o2 reaches a certain temperature. My o2 reads around .32 @ initial start up, then climbs as the car gets warm. o2 voltages should read between .90 and .94 @ WOT, while cruising, they should bounce all over the place crossing the .45 plane at sometime. .96 or higher is pig rich.