i have a 88 e-350 rescue squad as a service truck it is 4x4, 7.3 and a c-6 i have turned it in to a work shop on wheels, i put a jasper engine in about 2 months ago. with all new sending units and im still having an issue with my gauges flooting all around, i have oil psi. water temp, and fuel gauge, and seems as if a sudden jar or bump causes them to read higher then they should be all of them are effected at same time, if i have 3/4 tank of fuel, suddenly it reads full, i have checked the main plug on back of gauge cluster all seems fine please help me i am at wits end