Here's a look at the interior gauges that I have added. The brushed stainless panel was custom made by a friend of mine and the gauges are mechanical Autometer Autogage. Future plans are to upgrade these to the Autolite series. As you can see here the water temp sender is shot and that gauge isn't even working properly.
Here is another shot of the gauges. You can see where I have my Scanmaster 2 mounted over the radio and climate controls. I just took two pieces of velcro to attach it. Contact Mike at Ramchargers to get this must have scan tool.
Here is the 30/30 boost gauge on the pillar. I plan on changing the dash gauges over to this style also.
This is how I put in a manual high speed fan switch. It's a simple rocker switch from Radio Shack and almost appears as a factory installed switch. It allows me to turn on the high speed fan at anytime. If it's left in the on position after the car is shut off, it will automatically turn off after 10 minutes so it won't kill the battery.
Here is how the oil pressure and water temperature gauges are connected. I had the oil pressure gauge "T'd" into where the turbo oil feed line was as you can see below. However, since I have installed a PTE turbo saver with the TE44 turbo, I used the port in the block where the old oil feed line was coming from. I think having the gauge plumbed directly into the block is probably more accurate also. You can see the water temp sender "T'd" into the heater bypass hose using a brass homemade "T". Future plans are to plumb this correctly by removing the electric sender.