I just installed new heads and cam and i had a few bugs but most of them we fixed. Now for the others, the tach doesnt work does anyone know where the tach is attached to the motor? and also my oil pressure is really low after driving for a little while. When the car first starts up oil pressure is a little low 40psi then after driving for a bit it gets really low like right above the red line... anybody have any ideas?? i also replaced my timing chain with a double and before the got the car fully running everytime the car cranked up we lost antifreeze. we got all that fixed by tighting the head bolts after following ls1howto.com. Im figuring i will have to replace the old oil pump but i just wanted to make sure.Thanks in advanced