Dr.Jeff
True Classic
The sensor on top of the tube is definitely a air temp sensor...looks like a GM type. But the other item, on the side of the tube is a bit puzzling. Most set-ups use a MAP (air pressure) sensor to provide input, as Steve H said. However I've never known it to be mounted next to the air filter and they don't usually look like that one (but I'm sure there are all types). Usually they measure the vacuum/pressure in the intake manifold/plenum; typicallyWhat's in the tube providing air data? Hot wire or grid or something else?
a small vacuum hose attaches to a nipple on the manifold and goes to the MAP sensor remotely mounted. From there a wired connection inputs data to the ECU. If that is the MAP sensor for this one, mounted on the tube by the air filter, it would seem to give a incorrect input.
When I looked into the current offerings from MegaSquirt, I wasn't impressed. I'm no expert so perhaps I'm missing something. But they tend to offer fewer features, with older technology, for more money than several other products on the market. I won't go into long detail here (I don't want to hijack this thread, we can start another thread on if desired). But I think it is no longer the "bargain" it once was. The market has seen MANY new offerings at excellent prices.The current version of the MS system is very good and given its capability, support and cost