oil pressure guage reading low

[sprsta]

i have been noticing recently that my oil pressure guage has only been reading about one bar at idle and about 2 at 3-4 k revs.
i put a proper guage on it today to check and got 26psi at idle so its not so bad but it still should be at least 29psi.
i think i might get a new sender and tee off a pressure switch to have a nice big red oil light, im not planning on another motor just yet.
i have an oil change coming up soon so i think ill go for a 10w rather than a 5w the motor is getting on abit now

think there is any point in spacing the oil pressure spring to compensate?
or just try the heavier weight oil and see how it goes

[Nearly too late]

If you are close to a service I would do it now.
My 1990 MX5 1600 had low oil presure when I got it, did a full service which included a new oil filter (this should be changed at every oil change) and the problem disappeared.

[sprsta]

yeah ill do it next week that oil has done a whole 1500 ks but has been in there about 6 months
filter is always changed (there only 6 bucks)
think ill go for mobil 1 instead of the castrol edge that i used last time