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Idahome
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with a 95 mustang based 302 installed they should have simply installed the 91 Ranger coolant temp and oil pressure switches, so those gauges should work like stock.
The speedometer is simple vss mounted in the tailhousing of the transmission in both 95 and 91, so there is no reason the speedometer should not be accurate. The ranger is likely using the 91 style vss and drive cable simply installed in the mustang transmission
If the speedometer accuracy is off, it can be corrected with a different speedometer drive gear.
The rear axle coming from a disc brake explorer is most likely 3.73 ration but it could be 3.55 or 4.10, most gen II explorers were 3.73
The tachometer is the one gauge that needs some re working to work properly with the V8 tach signal
On the back of the 91 instrument cluster he should have moved the wire from the 6 cyl position to the 8 cyl position and that should make it read correctly.
If that did not work or was not possible on the 91 instrument cluster the fix is to install the tachometer head from any 302/351 F150 or bronco from 88-96.
That way the 91 tachometer will read like the ranger came from the factory with a 302
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I build custom RBV, specializing in drivetrain conversions, wiring, suspension and complete custom trucks