If it is a connection for long term use not to be fooled with (hopefully) for years, I first coat the connector center pin with Noalox anti-oxidant compound then "paint" it with liquid electrical tape available at Lowe's or Home Depot now.
I then "back wrap" it(sticky side out) with 2 layers of 88, then wrap it with several layers of 130C liner-less rubber splicing tape (secret to using this tape is to stretch it as you wrap it) and cover that with 2 layers of 88.
Final step is one more coat of liquid electrical taper for a weather-tight seal.
This has worked with very little failure for 30 years.
For a connector that might require more frequent service, i eliminate the inner coating of liquid electrical tape.
The reason you "Back-wrap" the first layer of 88 is so you can slice the whole knot with your knife and roll it all off to expose a clean connector.
Everyone has their favorite method, this is mine.
References:
Liquid Electrical Tape-http://www.starbrite.com/productdetail.cfm?ID=1076&ProductCat=RV&ProductSCat=Liquid%20Electric%20Tape&ProductSSCat=
88 electrical tape-http://www.shop3m.com/80610833842.html?WT.mc_ev=clickthrough&WT.mc_id=shop3m-AtoZ-Scotch-Super-Vinyl-Electrical-Tape-88
130C linerless splicing tape-http://solutions.3m.com/wps/portal/3M/en_US/Health/Safety/Products/Related/?PC_7_RJH9U52300A9E023IJD0GR3O74_nid=QXZ2MX2KS6be651JNCZ61Cgl