Topic: OK, So I did a couple of searches....

[ludite13]

Hi all!
  I had a friend comment on the amount of oil pissing out of my '78 550k today and I explained to him about the leaky head gasket and how I plan on rebuilding the top end when I get a few other projects settled.  Well, I stopped at the local market for some groceries and noticed a big brown puddle under the bike!
  I has oil pressure when it fired, so I rode the 2 miles home home and noticed a steady drip from the left side of the motor when I pulled into the driveway.  I recently replaced the chain and sprockets and was afraid of the chain eating into the case.  After pulling the starter and sprocket covers about a pint of fluid drained out.  Turns out the oil pressure sender failed.  I replaced it with one from my parts bike, but here is my question: 
  I swear I have seen this same sender after years of fixing Japanese cars.  Does this sender cross over to any Honda cars?  I work for an Acura dealer and may be able to get a killer deal on these if I knew what model it fits. 
  Thanks in advance for any and all replies.

-James

[OldSchool_IsCool]

Maybe take the old unit to the parts counter and ask the oldest guy there.

[mark]

You're right. It does look like just about every Japanese oil light switch ever made.

How about a '74 Civic?

As long as it fits, and there is enough pressure to turn the light off, it should work.

Happy trails.

[MikeBusch2]

I took my oil pressure switch to a local advance auto parts, and while they had a dozen or so different switches, none of them had the same thread size on it.  Some of them were close, but I didn't want to take a chance boogering up the threads.

[ludite13]

Well, just when you thought this thread was dead...
  I wound up using an oil pressure switch from my spare 550 engine and it worked well until a few days ago.  I noticed the kickstand left a small oil mark on my garage floor, but I was late for work and rode in anyway.  When I got there I was low on oil so I pulled the cover and dumped a few ounces of oil in the parking lot.  Anyway, I called the local Honda M/C dealer and ordered one over the phone.  When I picked it up 3 days (and 37 bucks) later I noticed the familiar Honda label lacked the winged "HM" insignia.  While I was at work today (I work at a Honda/Acura dealer) I had the parts guy run the number and it was good.  Actually my cost was 20 bucks better than the bike shop where I got mine.  He laughed and said his list was 6 bucks cheaper AND most dealers are getting daily stock orders on stuff ordered before 3pm.  I'll post the p/n after I order a couple more.  One for the shelf, and one to return to the local Honda m/c dealer (if they'll take it back.)  I'll also see if my parts guy can tell me what model vehicle the switch is from.

-James

[ludite13]

Alright guys, this took a while to post back.  I've been busy with so many other things.  The oil pressure switch part number is 37240-P13-013 and it fits '86-'90 Acura legends and '91-'05 Acura NSXs.  The part number is also good for Honda Automobiles but am not sure of the application.  The switch should cost around $20 bucks at the auto dealer instead of $40 at the bike dealer.  Hope this helps.

-James

[754]

I would just plug it and add an oil pressure guage.

[OldSchool_IsCool]

If the screw fits, wire it!