mechanical temp guage on 318

Where does sensor go for mechanical temp guage on a 318 block? Do you r/r the oem one on the intake or is there a place in the block?

Thank you thank you thank you for responding to my dumb questions!!!

put it on the intake so its in the coolant passage

Only problem with taking the OEM one out is that you will have to drill and tap it for the mechanical sender to fit. You have to keep the probe in the flow of the coolant so don't use a stack of adapters to get it to fit. With the adapters you will not a constant flow and a risk of air pockets forming giving erroneous readings.

Is there somewhere else besides intake to put mech sending unit? Head? Block?

Use a heater hose port use a bell and or T and it will work fine and not have issues with air pockets

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Use a heater hose port use a bell and or T and it will work fine and not have issues with air pockets

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As long as you have the heater water valve open so that you get a constant flow rather than a back flush. You need flow and with a tee and in the heater hose the only way to get flow is to have the water valve open. It may work for you but it may not and may not be accurate.