How to use mechanical gauge and idiot lights?

All you need to do is to use a T fitting so both of the old and new sending units can be used togeather. Good luck (y) :nod:
 
The oil pressure gauge can be a simple T fitting on the block' oil pressure lite switch port but the Temp guage needs to be in the coolant flow. Using a T fitting on the temp port supposedly results in a 'dead 'leg' and will not read accurately. So you can use the mechanical aftermarket temp. sensor bulb in the head port instead of the electric idiot lite switch but using T and both at head port may not work read accurately. An alternate location is in the front rad hose-thermostat housing. Some housings were tapped , most had the casting that could to be tapped.

have fun
 
With the oil use a tee. With the water sender, mount the mechanical one in the thermostat housing.
 
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