MegaSquirt Pressure Sender Wiring Diagram - Add Autometer Gauge Input to MS

This is a hand-drawn wiring diagram showing how to add an electrical pressure gauge (oil or fuel pressure sender) to a MegaSquirt (MS) engine management system so its reading can be displayed on tuning software. The drawing depicts a laptop displaying six virtual gauges, rpm, clt (coolant temp), oil.P (oil pressure), map, iat (intake air temp), and fuel.P (fuel pressure), connected to a box labeled MEGASQUIRT. From the MegaSquirt, two wires run to a 'typical autometer pressure sender from any electrical guage' mounted off the engine. The callouts explain the hookup: a 5V reference wire is wrapped around the top of the sensor body, a signal return wire runs to the MegaSquirt's internally built circuit, and a length of rubber hose is used to isolate the sensor body from engine ground (so the sender is not grounded through the block). A sketch of an intake manifold/engine shows where the sender connects via the isolating rubber hose. The document teaches a reader the basic wiring and grounding-isolation technique for feeding a single-wire aftermarket pressure sender into a MegaSquirt input for datalogging or gauge display.