I have an 87 evinrude 150 with the vro2 system. I'm reinstalling the oil tank and have noticed the tank only has a 2 wire set up while the engine is a 4 wire. I assume this means the tank is from the earlier model. I was looking in the oem manual for a wiring diagram to see about getting this set up to work. Nothing in the manual shows the vro wiring. So am I going to have to change the float setup in the oil tank to a 4 wire?