I need to order a new trans temp gauge. Looking on some advice on mechanical or electrical type gauge. I'm going to go with an Autometer UltraLite, but not sure on Mech/Elect. I like the electrical because the wire to the sensor is easy to run. Anyone have experience with the mechanical and running the tubing?

I went with electrical on my old pump gas street Duster so I could use three sensors with a three way switch so I could read the water temp, oil temp and trans temp. on the same gauge when I wanted to look at all three individually.
I use to use all mechanical temp. gauges until I had two different good brands, Auto Meter and Stewart Warner, read way off on the temps. on my old race Duster

I vowed never to use a mechanical gauge in the car again after an oil pressure gauge pissed all over the carpet. Still keep one in the toolbox for diagnosing though.

The probe on the mechanical temp gauges can be large and at times more difficult to adapt than the electronic sensor. If you can get past that, running the capillary tube is no problem. Oil pressure gauges IMO need a braided stainless line. Those nylon tubes always leak eventually and you end up with oil puddles inside your car. Be careful with your gauge selection because the cheapo mechanical oil pressure gauges are only threaded for 1/8 tube flare for the compression fitting where the better gauges have a NPT thread on the back.

I was always a gung-ho mechanical gauge guy but I bought electrics for my most recent project.

Electrical gauges have gotten much better ( more accurate ) over the years. I wouldn't hesitate using them anywhere.

In the race car its all mech... but in the
street rod its all electric.. plus like CAB
I run a couple of sensors on the same gauge
and just flip a switch for each reading