I don't get gurgling noises at start up and I don't think you should but it isn't the end of the world fortunately. On my car you only get these noises once the thermostat is opened in the rh front wing and the oil is flowing freely; then it gurgles away like a good un. Does your rh front wing get hot at all? Faulty thermostat is a strong possibility if not and easy to diagnose.
The oil level indicator means nothing until the oil is hot, the car is stationary and has been for at least 30 seconds and, most important of all, the motor is running. In these conditions, the indicator should give a meaningful reading and ideally will be at the half way mark or higher. To be safe though, when you do this check, take the opportunity to check the dipstick as well and this ought to show you the relationship between the gauge and the actual level in the oil tank. Don't turn the motor off when you do this. (And mind the belt and pulley which will grab anything dangling....). You are looking for the oil to show at least half way between the marks - less is OK but try to at this level or slightly higher - and don't overfill either. Clean oil is a complete bugger to see on the dipstick so you will need to practise a bit. When filling, keep the motor running, add some oil then dip the tank again after a minute or so - don't chuck in a litre at one go.
On my car, the gauge is very accurate and I tend to rely on it most of the time, only bothering to check the tank about once a month irrespective of what the gauge says (unless it reads very low obviously). If you find your gauge says high but the dispstick says otherwise, you will need to check the tank more often. Common practice seems to be to run with the tank filled to the half to three quarters level on the dipstick.
