Yeah you can install the cluster without the lense on it.
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Yeah that is what my truck was 95 TBI, all you need is an obd1 live data scanner.
Yo Griff' you should do this.
You can buy these scanner's from several part's stores, just find out if they do obd1 live data, they probably run 300$+ I have one that will do both obd1+2 live data, it will tell you everything except the oil pressure, not to mention they are great for diagnosing problem's.