Wiring nightmare - tachometer

[RoughBoy]

Hi Y'all.
I joined up because I couldn't get my questions answered searching around for days. From what I've seen, this forum seems pretty helpful, so let's give it a try.
I have a 1990 Stratos 290SF, 1990 225 Johnson.
It runs great and we've had lots of fun with it but now it's time to make some things right.
I got a good deal on it planning to "restore" it. So far I've had the rotten floor replaced, carpet, seats redone, re-cleared and new graphics above the bumper rail. Got the motor serviced and put new bearings and tires on the trailer. Now its DIY time.
I want to fix the tach but I'm unsure of the wiring.
Which post on the back gets the input? The 12v & ground are labeled so no problem there. There's another post marked PUL and one with a circle with an "M" in it.
here's a picture. Please help me out. Thanks!

 

[sam am I]

PUL = Pulse.......That's the tach's signal in stud. The "M" is just the manu's logo, BUT the wire on the stud next to that logo is the back light feed wire and stud.

 

[RoughBoy]

Okay That awesome info. Now I can get to work and make sure those are going to the correct location.
The "courtesy Light" toggle is broke. I can rig it up how ever I want it to work but, typically, does it also light up the dash?

 

[RoughBoy]

Oh! Sorry. In my excitement, I forgot to say THANKS!

 

[sam am I]

Oh! Sorry. In my excitement, I forgot to say THANKS!

You're welcome

The "courtesy Light" toggle is broke. I can rig it up how ever I want it to work but, typically, does it also light up the dash?

No not usually, usually courtesy lights are just lights that shine on the deck and/or on steps and such. You should have just a "dash" switch...........

 

[RoughBoy]

Thanks Sam am l.
I've run into another wire issue. I think not a big deal but but since I'm new to this stuff I'll post up my question and pics when I get a chance.
Thanks for your time and patience. Hopefully soon I'll be able to answer questions for others.

Brodie

 

[RoughBoy]

While following wires around and trying to sort out the bird nest left by someone, I found what I believe are the original tachometer wires. They are black, grey & purple coming from the stern. They feed into a plug and the purple wire is cut/broke right where it comes out so it's too short to splice (pic). If read the sticky wire diagram right, purple is a power feed to the tach, black is ground, grey is pulse.
My question is about the plug: is it something more than just a water tight plug? Do i need it or can I just bypass it for now?
Yeah, yeah, I know "You know nothing John Snow!" applies to me regarding boat stuff. It's a new realm for me and I just need a little guided practice to get the hang of it.

Thanks Y'all

Brodie

 

[sam am I]

If read the sticky wire diagram right, purple is a power feed to the tach, black is ground, grey is pulse.

Correct

My question is about the plug: is it something more than just a water tight plug? Do i need it or can I just bypass it for now?

Don't need it......Bypass. Tape off that loose purple wire though.