To add EGT and FP to your Insight, you're gonna need:
EP98603 EAS Starter Kit Cable w/EGT
EP98605 EAS Universal Sensor Input Cable
EP98607 EAS Pressure Sensor 0-100PSI 1/8" NPT
Been there, got the t-shirt... now I need time to install it all.
Some notes about the pressure sensor...
The Edge 98607 0-100PSI gauge kit consists of:
An ISSPRO R89141 0-100PSI pressure sending unit, and a wiring harness.
The wiring harness has the ISSPRO connector on one end, and a 3 position Weatherpack connector on the other (it plugs in to the EAS Universal Sensor cable).
There is an ISSPRO harness, the R72014, that has the ISSPRO connector on it and fly leads. It could be spliced to the Weatherpack connector that is included with the EAS expansion cable already (the include the Weatherpack connectors to add "universal" 5V sensors).
That said, you are probably going to pay about $20 for the R72014 and $65 for the R89141 if you "roll your own". This isn't much less than the $100 you can get the Edge one for anyways.
Another tidbit... the ISSPRO R89141 is supposed to be scaled 0.5VDC=0PSI --> 4.5VDC=100PSI and linear in between.
Another note... best price I found was xtremediesel, using their 10% off coupon.