Good Info on Water and Engine Oil Temp.

Taken from Sifu Mr KN Wong's comment and edited to summary.

Oil Temp 120-130degC is way way too hot for the oil to run. That corresponds to water temp of almost 140degC.
The general guideline in the US Honda tuning circle (e.g. Hondata) is to limit water temp to a max of 120degC. 110degC for oil temp is quite the limit. Some engine oil manufacturers claims that their oil can go to 140degC but you plan to run the engine oil at 130degC and above, then be prepared to get a warped cylinder head and burnt gasket in the very near future.
Stock PGM-Fi drastically richens the AF and retard the ignition once water temp hits 100degC. At 100degC, the ignition can be retarded by as much as 5deg.

The OEM water temp is a non-linear guage. It will be stable around the middle until around 120degC after which it will move drastically. Because the aftermarket water-temp usually places the sensor in the hose between cylinder head, it will often read different temperature than the stock sensor which is attached to the cylinder head. The stock sensor tends to overread since it is also being affected by the cylinder head which is hotter than the water. The aftermarket meter tends to under-read since water would have time to cool a little bit in the rubber hose. Also, be careful of low water level because that will lead to false low temperature readings.

Summary:
1) Oil Temp (Try to limit below 120 degC).
2) Water Temp (Try to limit below 110 degC)
3) Go and get Water temp meter (critical) and Oil Temp meter (less critical) if plan to track the car.

Thanks to Mr KN Wong for his information. (FYI: He is driving a VTEC turbo)

Oil Pressure vs Oil Temp.

There is heavy rain today before we are off from work. This rain significantly cooled down the car's engine. I took a look at the gauges and below are some of my observation.
1) When i start up the car from cold, Oil Temp is less than 50 degC but the Oil Pressure shoots up to 6kg/cm2 (Engine rev at ~1k).
2) After waited for a while, oil temp reaches 50degC and Oil Pressure drops to 5kg/cm2.
3) After a few minutes of cruising drive, oil temp goes up and stabilize at 85 degC and Oil pressure drops to a stabilize 2kg/cm2 (Engine rev at ~1k).
With this observation; we can see that as temperature goes up but the oil pressure will drop. This normal is due to the effect of increasing engine heat causes the oil viscosity to drop. Lower viscosity oil means that the oil can be compressed more thus lowering the pressure at the same engine rev (1k).
Therefore it is advisable to let your engine to heat up for 1~2 minutes before start driving it to ensure the oil viscosity is at lower optimum spec which is able to flow and protect your engine life by reducing wear. If you drive your car hard immediately after cold start, you may cause much more wear in your engine component as its lubrication is not optimized yet.(Hope this helps 4 newbies)

Oil Temp, Oil Press, Water temp readings.

Finally got all my gauges install, i know these are cheaper Taiwanese gauges (can not even compare to DEFI, Apexi or HKS). I do know know how accurate the reading is but you can see that the oil temp tint is not even and is much darker one side so you get what you pay for. :) Below is some rough guide and readings i got from the gauge.

Oil Pressure (>2 kg/mm2): Idle (2~3), Cruising (3~5), VTEC (6~6.5)
High oil pressure : ( suddenly increases) Pressure relief valve could be not working.
Low oil pressure: Insufficient oil in engine, leakage, damaged oil pump, and worn out oil.

Oil Temp (<130 degC): Idle (85~90), Cruising (80~90), VTEC (slightly above 100)
High oil Temp: Insufficient oil level, insufficient cooling (if modded), blocked passage, damaged oil pump, bad bearing and worn out oil.
Low oil Temp: Over cooled engine, normally due to oversize oil cooler used.

Water Temp (<110 degC): Idle (85~90), Cruising (80~90), VTEC (slightly below 100)
High water Temp: Thermostat jam, insufficient water, insufficient cooling (if modded), blocked passage, damaged water pump, and worn out coolant (normally water is ok unless heavy mod engine).
Low water Temp: Wrong radiator size causing overcooling or slow heating up.

Update 16 March

I got my sensor and adapter installed today while changing the engine oil. The easiest to install is the water temp adapter, but you need to cut the hose.
















Oil Pressure sensor is hard to install if directly install on to the adapter. So i got the L - connector to help angle the pressure sensor to ensure it fit into the position. Check out the oil filter area, no room for the sensor, it is not easy trust me :).

My Next Addition.

A pictures says a thousand words" So now there is a few pictures, do i need to say more? I plan to DIY this to save the workmanship charge but i do not know how much i could save.... Funny rite? Should I DIY (more satisfaction and better budget)? Even the meter pods was planed to DIY too... :P. With these, it would be much easier for me to know how my car can react at that time......
Where should i place the meters? On the Dash? On the Pillar? I plan to have it on the steering wheel hub (between the original meters and steering wheel). If you have any idea, please comment. Thank you in advance!