Chris helped me out tremendously with making my two gauges (pressure & temp) perform two different functions a piece by drawing up a color-coded wiring diagram as well as suggesting which switches to use. I had been putting this off because I was afraid to cut up the gauge harnesses without being completely sure where each wire goes.
Thursday I started trimming the gauge harnesses and adding connectors and switches to both. I got it completed yesterday, everything worked perfectly. I added small labels to the mount to use as a cheat-sheet till it's commited to memory.
I'm using the temp gauge for oil and water. Problem with using it to monitor coolant temps was that the ECU had its own dedicated sensor for coolant temp so an additional hole needed to be added for the gauge. . . I used one of the coolant bypass ports for the extra sensor by drilling and tapping NPT threads. I've heard plugging the bypass ports is a no no but these ports have been inactive forever without any problems (that i'm aware of. .)
The pressure gauge I'm using for both oil and fuel. No issue here other than the need for a pedestal to mount the two extra sensors for monitoring the oil. I decided to use the FFE 13B REW pedestal that will work on a 13B when the REW's oil cooler hole is plugged, I found the plug on eBay for ~$5 (not pictured).