I have a Tripplet 9045 meter. But I bought that mainly for my electronics work. Its a really nice meter. Does all sorts of stuff, most stuff more expensive Fluke units do too. The Tripplet was around $80 I think.
For automotive work, the most basic of meter will work. I've got two of these $2 unit,
http://www.smcelectronics.com/PICTURES/DVM1-L.JPG They cover 99% of what you need for the DIYer.
As for the oil gauge. I'm fairly certain stuck at 3 means something but I cant remember what exactly.
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