Put your MAP-clamp to the test. Will it report 4.5 volts? This plugs right into our car's wiring. Kinda cool. http://www.mamotorworks.com/corvette.html?frame=1.66.885
Actually there's a whole shite-load of test-equipment sold either individually http://www.mamotorworks.com/corvette.html?category=1.66 or as a set http://www.mamotorworks.com/corvette.html?frame=1.66.881
