SPA gauges?

[MCrossley]

You are correct.... it is

It seems the pressure sensor on SPA's boost gauge is affected by changes in atmospheric pressure. If I zero the gauge before I go to work at 1,300 ft. above sea level and drive up to about 5,000 ft. , it will eventually show around -20 boost at idle and under accleration maybe get to -5 to 0 psi. I noticed this today. When I returned to 1,300 ft. elevation at the end of the day it will read o psi. at idle and normal reading all the way up. The next time I go up in elevation, I'll zero the gauge up on the mountain after it acts up and see if it will register accurately . If I'm correct, as I decent the mountain and loose elevation ,the gauge should start showing incorrect numbers again. The gauge has needed to be re-calibrated only a few times when driven at a consistent elevation since I've installed it. It seems large elevation change of 4,00 + ft. will affect it regularly.

SPA confirmed that some time ago when I asked...

 

[BigBadDodge]

By far the worst mod I have ever done to my truck, I have had three sets over the past five years. you will always be working on them. IMO there to problimatic, unreliable, and require a lot of time. Something I don't want in a gauge set.



Just my two cents



BBD

 

[TomGolden]

I have had my SPA Series 2 guages since April of 2002 I think. I have Boost/EGT, Engine Oil temp/fuel pressure & transmission/rear diff temp. I have never had a single problem with the guages themselves, but every one of the connections to the sending units were flaky, and so I finally got tired of that nonsense and cut the SPA connectors off and soldered spade type connectors on them.