16 minutes ago, dizzygti said:

The dealer locator says enter a postal code, not a state.    It works for me if I put in a ZIP code.   

Tommy's probably wasn't your local dealer which is why you are locating one.

14 minutes ago, dizzygti said:

The dealer locator says enter a postal code, not a state.    It works for me if I put in a ZIP code.   

I tried several zip codes in my region and received the same message.

1 hour ago, Slayer said:

Yes, same result here.  There are 2 other Malibu dealers in Michigan.  Yet this is the same result when I enter the state, or my zip code.

 

The dealer locator says enter a postal code, not a state.    It works for me if I put in a ZIP code.   

I occasionally use a 1/4-18 NPT tap to clean up the threads for the knock sensor in our 2000 LSV, also w/ an Indmar Monsoon.  There's still not a lot of thread engagement... it tightens up after just a few turns.  I don't think that's unusual due to the tapered nature of pipe threads, but seems like you should get more than 1-2 thread engagement.

Should be 1/4 NPT so a thread chaser for that should work. But you should measure the sensor just to be sure.   Note: some older blocks had a 3/8 NPT and a small threaded fitting that the 1/4 NPT knock sensor threaded into.  My Supra had the 3/8 NPT.