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A belly pan doesn't need to be expensive. Get some corrugated plastic from the local politicians after an election. My girlfriend is in politics and got me a ton. It's a time investment and doesn't have to be expensive. It'll cost you some sheet metal screws and washers. The materials are easy to work with, just don't melt them.
An electric fan is awesome and the Ford Mark VIII fan mod is fairly easy and you can find lotsa stuff online on it. Use it with a Volvo 2 speed fan controller and a BMW temp sensor and you're off to saving even more!
I've successfully got my 1990 1/2 ton Chevy Silverado running an old TBI setup to get 31 mpg (see Silverado30mpg)!
If you don't wanna spend much money on gauges, get an old Android phone and run Torque Lite after getting a bluetooth ELM327 obd2 unit off DealExtreme for $12.
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