I use crimps and lots of heat shrink. My current car has no tape anywhere on wires. Tape just make a gooy mess IMHO.
Here is a site to get about any wire related stuff.
http://www.waytekwire.com/CatPDF.htm
I probably have in excess of $700 in terminals, wire, and connectors. As it turns out just as with nuts and bolts, you always seem to be short of the last connector of don't stock them so Monday you have to order another pack. haha
The dash shot is similar to mine today. I added and AFR gage and a transmission oil temp. Simple enough. haha
Drain the trans pan...Exon Valdez on the floor. Clean the pan and floor figure out where to put the sensor bung...oops welded on the front instead of the side. Luckily it clears and may be a better choice anyway. Install Lokar locking dip stick...no problem, slick item fixes major leak. Re install pan with new filter and gasket and fluid. Carefully torque the bolts. No leaks. Then....
Drop the exhaust pipes and install O2 sensor bungs after making sure the sensors can be installed. Reinstall pipes.
Mark dash for 2 new gages and find that 2 in hole saw has seen better days so use 1 7/8. have to ream out holes being careful not to chip gel coat. Also add holes for LED indicator and calibration switch. AFR module has 6 wires to connect. Simple hahah They are micro wires probably 28 gage or smaller I can hardly see them. It takes the better part of the afernoon to route the module wires then I have to hook them to the gage and the cal swith and LED. Oh I forgot my car is plastic so I need good grounds. My big ground terminal board is full so I have to connect up another one. AFR recommends grounding directly to the block so another wire has to go thru the firewall grommet. More time. Finally get everytime hooked up. Then....
On to the AM temp gage. Already have run the sensor wire up thru the firewall grommet. It needs a ground, good, already have a nice new ground board. have to make it removable with connectors so the dash can be later painted so more time making secure but removable connections. Try to keep things neat and orderly. Luckily I had all the right color wires and the small connectors from another install. Finished except for re hanging the dash and its attachments. Sure would have been nice to think about these additions when I did the original gage install.

Moral of story is; plan far, far ahead and don't go cheapo on supplies and crimpers. Add ons and redos really take their toll later on.

Interesting side. I recently completed a wiring job that I quoted and the customer choked at the price. So I said well, line out the items you don't want me to install and I'll adjust the price according. He chopped about 1/3 of the price off. As I was nearing completion of my part he simple said just go and finish what I lined out too plus install the AC. Net affect was increase the bill to original (agreed on) plus agreed cost of AC install.