Previous owner F'd up white face guage install

[withamc]

The previous owner screwed up the white face guage install on the '93. The voltage reads 18 all the time, I know that's wrong, it's about 13.5 - 14. The oil pressure reads at the top of the scale, I'm pretty sure it's a bone stock engine without a high flow pump. Temp seems about right, I've got a 180 stat in it and it reads halfway between the 2nd and 3rd mark. I'm hoping I can just pop the needles off and push them back on where they belong- right? Voltage is easy, But how do I know where the oil pressure guage should read? Does anyone know what the oil pressure is based on the sender readings?
Also, they are white needles on a white background. Hard to read during the day. Can I paint the needles red and still have them look OK with the lights on? What kind of paint?
And since he didn't put the clear plastic bezel back on, where's the cheapest place to get one of those?
Thanks - sorry it's so long.

Chris

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86 GT, CCM long block, GT40P heads, Crane 2031, 1.7 RR's, Cobra intake, 65mm TB, 73mm Vortech, 24# injectors, MAC GT40P headers, 2-1/2" BBK H-pipe (w/cats), Flowmasters, 3.55s, Groundpounder subs and lower control arms, 277 RWHP.
93 GT - Moroso cold air, 3.55 gears, ?? shifter, Black Magic fan, soon to get the engine and other goodies from the 86

[This message has been edited by withamc (edited 05-23-2001).]