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Installing a Water Pressure Gauge on 1998 150 XL

Kingfish22

New member
I have a 1998 150 XL Merc. and have been trying to install a water pressure gauge with no success. There does not appear to be any dedicated port for a such fitting into the cylinder head. I ended up tee'ing it into the tell tale tubing but I get no pressure reading whatsoever. I would love to have it fitted into the block (without drilling and tapping in a new port). Am I missing where there is place to screw in the fitting? I see the temp. sensor... and temp sending unit locations. Model # 0G752730. Any thoughts really appreciated... I installed a temp gauge but the pressure would also be quite useful. Thanks!

 
You need to drill and tap where the water goes IN to the power head.

Jeff

Thanks Jeff... was hoping someone was familiar with my year engine and there was already a existing plug to thread in to (that I'm not seeing) so I didn't have to do that drill into the power head and tap. Curious why (with the manufacturer's instructions followed) I am not getting any pressure from the tell tale line (I do have a steady pee stream coming out of the indicator).
 
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