Supposedly you can get an assortment of parts at Napa to make up an adapter for the cold start injector line for a gauge. Or I plumbed an electronic sender into mine. I drilled and tapped the back end of the fuel injector rail (steel cap) for 1/8" NPT and then soldered in a brass elbow and screwed the sender into that. Wires run to a 0-100psi gauge inside the cab.