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As no one answered you I will try.
OBD1 is not standard; each make of car had a different plug and different standards so no one made MPG and engine system like the scan gauge II for them.
There are a few OBDI trouble shooting scanners out there, be sure you can get the adapter for your car/truck.
The MPGUnio can work on an OBD1 as IT does NOT use the cars computer, it runs off the VSS and a fuel injector. It will only give you the same readouts of its programing.
I have one on a 1993 Chevy Van. Sadly it seems not as accurate as I have seen on my 2000 Ford, mainly due to A) my van is a two injector TBI system and B) I have not taken the time to finely calibrate it.
Rich
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