COMPUTER COMM/ OIL PRESSURE
so i have an 03 international flatbed tow truck that we have swapped a motor in. after finally getting it running i noticed that the truck would run rough when the engine oil pressure was at 80 psi. after a few minutes the engine oil pressure drops off to 20 psi and the engine smooths out and runs good. i've tried to connect my scan tool to look at data, but the scan tool is not acting right. it will start to power up and then it will shut off and try to power on again. so obviously i have an electrical problem somewhere, but i am not a diesel tech so i really have no idea where to start. any suggestions would be appreciated. thanks.
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2003 International 4300LP 7.6L