Volts is cake!!!
Just tap into any power source... Literally...
But this is what I have:
For Oil:
http://www.glowshiftdirect.com/oilfiltersenderadapter-20mm15thread-1.aspx
For Fuel:
http://www.nitrousoutlet.com/catalog/product.asp?category=24§ion=70&group=407&product=3536
Water temp...