QUOTE(mikeair @ Apr 9 2009, 01:19 PM)
yo long time no see

QUOTE(Azuma-kun @ Apr 9 2009, 01:24 PM)
Erm...coz i saw in ur thread u mentioned cannot face rushing air coz will cancel the vacuum pressure
But that was long time ago, u editted already.
Somebody quoted it.
nola... i felt no difference, dats why edited it... but i cannot edit ppl's post mar...
QUOTE(masao343 @ Apr 9 2009, 02:16 PM)
the vacuum meter fascinates me - does it benefit an EFi car like mine? eg, if the vacuum reading is too high(low?) then means i should improve my intake system or something?
voltage one, i guess i can guess its to measure that my car has sufficient/stable voltage for its operations like radio ON, AC on, headlights ON, foglights, etc? btw quick one, those add-on voltage stabilizer kits, can DIY right? anyone knows how? i'm skilled enuf with electronics but i'm not sure what size of capacitors to use, how many, and how is the connection will be. anyone got the circuit diagram somewhere? thx
finally the oil/water temp gauge - what does the readings mean actually bro? pls guide me a bit so i can at least follow those more technical articles i found with google pls? thx thx!
yes... all naturally aspirated engines can use vacuum gauge... the vacuum reads negative pressure... means the pressure inside ur intake manifold is lower than atmospheric pressure... the higher the reading, the lower the pressure... most NA engine has intake manifold pressure hovers around 20mmHg during idle rpm... when u press on the throttle, butterfly valve opens and pressure inside the manifold increases towards atmospheric pressure... datz why when u full throttle, ur needle shows 0mmHg... means outside pressure n intake manifold pressure is the same...
voltage gauge is mostly useful to monitor ur alternator health... whether it is charging or not... if the voltage is around 11.9-12.1v even engine is running, most probably ur alternator is dead... a dead alternator would not charge ur battery, causing ur battery to lose its lifespan quick...
diy voltage stabilizer??..

as for oil/water temp reading i not sure as i didnt install it yet.... oil pressure is useful to detect oil pump failure or potential leakage around the oil lines and engine... oil temp useful especially for turbocharged engine... NA wouldnt have much use.... water temp is important as oem water temp in ur meter cluster is deemed less accurate...