OBD Monitors

[SVX92-97]

Took my 97 to Emissions today, and test could not be completed because I had two or more readiness monitors unavailable. My problem is I had two codes, PO500 speed sensor and PO505 idle control. I replaced the idle control valve last week with a used one I bought on ebay, and cleaned the entire throttle body which very dirty. I have not had the idle control valve code come on since I last cleared it nearly 100 miles ago, but the speed sensor code came on thursday night on my way home from work. I cleared it and drove 30 miles with it off, got home shut car off. Yesterday took a short trip of five miles and came back home and shut car off. Then this morning I took it to emissions a six mile one way trip. So I have only put about 50 miles and two drive cyles on since last clearing the CEL for the speed sensor. Emissions told me to drive it over the weekend and come back on Monday. Problem is if I drive much more, I risk having the CEL coming back on again, and then Im starting all over again. My question is, is there a tool I could use to plug into the OBDII system to reset the OBD Monitors to a ready status to get it thru emissions before the CEL comes back on. My registration expired on the 5th and I cant renew unless it emissions compliant. Thanks