Early 90s Ford Truck Oil Pressure Gauge?

I was curious on my 1990 F-250 with the 460. The oil pressure gauge only reads in between the quarter and half way mark of the gauge no matter the temperature, if you are at idle, accelerating, or at a constant speed it will just stay there. If you shut it off it will drop to the L obviously. This thing has me stumped. My 95 F-150 when I had it would stay at the quarter mark till you got on the road, then it would jump to over half and stay there.
My old 92 GMC Sierra would always jump to 60 PSI when you started it and drop slowly as it warmed up but never go under 40 PSI when you were driving. At idle it would drop to 20 at normal operating temp. Same with my 95 Silverado. Makes sense because as the oil warms up it gets thinner.
So is this just a Ford thing? Or should i get it checked out?

Parking lights not coming on?

The parking lights, for my brother in laws 1990 Ford F450 Super Duty diesel, will not illuminate. The headlights come on just fine, but the parking lights won't. I've checked the relay and the 15 amp fuse and both have checked out fine. They stopped working about a month ago, I've traced wires and I can't find any short to ground, I'm running out of ideas. Any help would be appreciated.

What used truck to get for towing, tundra, duramax?

I'm, currently looking to get a truck for the main purpose of towing my off road truck to the desert. I plan to get a 18ft car hauler and my truck weighs about 3100lbs. Ill also have a couple of dirtbikes in the back as well and some camping stuff. My price range is about 20k give or take a few thousand. The trucks i have been interested in are the Toyota tundra 07+ with the 5.7L, the Chevy 2500 duramax 06 or 07 and maybe a ford f250 or 350 with the 7.3L on the 99-2001 range. The tundra is the only gas model that i'm leaning towards since it gets great reviews but i hear good things about the chevy especially for those years. Price wise i've seen the chevy at the higher end even with what it seems to be alot of miles 150k+ but i don't know how long those engines last. I know the tundra is a good truck but not sure with the towing capacity.

i'm in so cal so there are some grades i will be climbing to get to and from the desert and ill take any suggestions on different trucks as well, i just want my money to go in the right direction thanks

Best used car to purchase?

Long story short, my jeep was just deemed a write from getting rear ended at a stop light.
My work van is a ford f350 v10, my boss is okay with me taking it home and using it for whatever but said to put in my own gas for personal use.
The thing is killing me, so I need to purchase a used car.
Looking for most bang for my buck when it comes to reliability.
My thoughts are a Toyota corolla, honda civic, or Hyundai accent.
Can't really spend more then $4000 so need something cheap like those with under 200,000km
Lots for sale for what I'm looking for, just looking for the best to purchase.

Also if there's any other cars please tell me!
4cyl only, had a v8 crown vic before my jeep and it's the same story as my work van.