Look at this on eBay:
http://pages.ebay.com/link/?nav=item...d=110373059322
60 / 80 AMP RELAY SPDT SINGLE POLE DOUBLE THROW NEW 654
Since this thread is about bypassing the clutch switch I will explain step by step details of the Starter Relay Installation in a separate thread.
I have had several types of No Starts in 1991s and 1990s and the Starter Relay in conjunction with Starter Solenoid Restoration cured them all.
See item #2 Electrical Ground Connections and Installing Starter Relay
See also Starter, Starter Relay, Wiring Harness, Battery, and Plugs Tricks
Keep in mind the starter Solenoid wiring in this very early 1990 is 12 gauge red (NOT PURPLE) which is rare.