Does anybody make gauge/monitor like the ScanGauge for pre-OBDII vehicles? I'd like to monitor more of the specifics of my truck, especially while towing, but I don't want to cover the entire A-pillar with gauges (not to mention the price of outfitting all those gauges). A few items I'd like to have physical gauges for such as a vacuum/boost gauge and transmission temp, but I'd also like to put a number to the water temp, oil pressure, and battery voltage rather than the un-numbered dials on the gauge cluster along with additional monitoring for intake air temp, oil temp, etc.

If there isn't anything out there for OBDI, is there a digital gauge that has multiple inputs so I could add my own separate sensors but have only one face to display the data on?