I just noticed this thread. I'm not sure what he used back inthe day. But I can find out. There is a great mag called Two Miles from Heaven that, in one issue, lists all the gear of all of the players.
For the reuinion gigs he definately used Ashdowns, a pink thunderbird and a couple of other basses. They brought out his famous Swallow bass every night, but he didn't play it. I was fortunate to meet and hang out with him every night after the shows and he told me that that bass is pretty much unplayable now. But it still looks cool

I have some great pictures from the shows. I can't seem to post them here, but if you pm me, I'll send you some.
Pete is a real nice guy that was totally surprised by the interest in the reunion gigs. He couldn't believe they sold out five nights. He couldn't believe anyone even remembered him. But he got a huge cheer everynight during Hymn For The Dudes when his name is mentioned. Search out the live cd of the first night's reunion. He plays incredibly well considering he hadn't been on stage in almost 30 years.