i have a problem when oil gage reads 0 then check gauges lights up-ram 1500 1998?

Answer 1

or you could have a clogged oil screen if there is a lot of miles with just adequate oil changes.....heavy on the sludge and also blocked return ports in head for oil drain back to oil pan

Answer 2

if its not a direct direct read pressure guage( a small oil line goes to engine) either the sensor died or the sensor wire broke or got disconnected.