TOPIC: Question for doc

I have two mid 70s tower of powers , one is a 150hp with distributor and one is a 90hp with cdi ignition ,I have also had acouple of parts motors . None have had any type of sender for temperature , I notice on he top of the block there looks to be a place to mount a sender is that where I can put one and would you know a part number for the sender. Thanks for any info you Can give me Hodgify.

The item in question is #26 in the late 115-6 parts break-down.
www.marineengine.com/parts/mercury-outboard-parts/115-6-cyl/6436123-and-up-usa/end-cap-manifold-and-exhaust-covers

BUT,...
IMHO
It is like the Doppler Radar Warning Device (radar detector) in a car - it only tells you when you have just been had by the police radar. In other words,...When the warning horn sounds - your Merc is already internally damaged significantly.

Just to clarify,...The 1500 inlime-6 has a CDI ignition (capacitor driven ignition)
If your 90 HP inline-6 has (6) coils on the starboard side,...That ignition is referred to as an ADI ignition or - (alternator driven ignition).
If your 90 HP just has (1) coil,...Consequently it is the same (CDI) ignition as the 1500 inline-6.
The ADI ignition was introduced in the 1979.5 models of the inline-6.
This same ignition (ADI) was first used in the 1975-1977 4 cylinder Merc 850.
It continued to be used in later model 80 4 cyl, 75 4 cyl, and the inline-6 through 1988.
It was also used in the early Looper L-4s ('88-'92) & the early v-6 Mercs.
The cool part about the ADI ignition is that there are a lot of ignition failures that can fail, and you can still limp back to the dock.
If you have the CDI style ignition (CDI),...When it fails it is time to tell your Wifey-Pooh to man the paddle and make her way to the boat launch while you relax and drink all the beer!!!

doc F

Thanks Doc , my 150hp has distributor with one coil and the power tilt and trim pump is a separate unit , my 90hp has the six coils with the two power packs and the tilt and trim is one unit in the transom mount bracket.