Instaling gauges

[chipis]

Hello,
would like to get some advices regarding aftermarket gauges.
1. oil temp gauge, where best to fit it?
2. oil pressure gauge, where best to fit it?
3. fuel pressure gauge, where best to fit it? will it be enough to have 2bar gauge for fuel pressure?
4. coolant temp gauge, where best to fit it?

I know that these gauges are aftermarket ant might need and probably will need to make some modifications to install them. Just want to confirm to which places in the motor these ones should go. any thoughts are welcome!

[chezzer85]

1. Sump or sandwich plate, think sump would give better reading but more hastle
2. Sandwich plate
3. Not sure
4 Not sure either