| The stock boost gauge isn't so much inaccurate, as it is poor resolution. Which means it's difficult to "accurately" tell what the boost level is. If you're only running 12psi you could borrow and install a temporary mechanical (best for temp. set up) confirm that 12ish on the stock gauge is really 12 and leave it at that. If you're a boost control fiddler, then a decent gauge is probably a good idea. Electrical boost gauges come with their own sending unit (like the stock one) that has to get mounted. Meaning, you run the boost line to the sending unit and then it converts the signal to electrical to send to the gauge. Mechanical ones just get the boost line plugged right into them. Some would argue that the longer boost line (into the cabin) will effect response time) I picked electrical to have a "permanent temporary" gauge. With my elec. I can just unplug the elec connector and remove it. I have two A pillar moldings. One has the elec boost gauge mounted in it and one stock. When I go to the track or on a spirited drive, I pop in the elec boost gauge. It literally takes 1-2 minutes to do. For DD, I just use the stock A pillar and the stock boost gauge.
Happy ZX'n
-Dan
'93 TT Mar '02 - present
'94 NA Jun '99- Mar '02 
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