Tuhia he tomokanga mo tenei rarangi - I mua i te 1990 ka kati a Morales Motorsports ka kati a Patrick Racing i te kaupapa Alfa Romeo me Guerrero e taraiwa ana i te No. 20 Miller Genuine Draft March 90CA-Alfa Romeo Indy V8. I eke a Guerrero ki te whakataetae Indianapolis 500
, ka tīmata i te 28th, ka mutu i te 23th nā te kino o te whakatā. Katahi ka huri te roopu ki te whakamahi i te &lt;a href="Lola%20Racing%20Cars"&gt;Lola T90/00&lt;/a&gt; ka tiimata mai i te Marlboro 500 i Michigan International Speedway. I te whakataetae, i mutu a Guerrero i te tuarima o nga waahi. I te mutunga o te wa ka mutu a Guerrero i te 16 o nga tohu me nga tohu 24.