I finally found the short that was blowing the horn fuse. The kid had wired in an accessory light but didn't tape up with hot wire...poof it went with the vibration of the car when it grounded.
Next question. This 92 auto cabby, seems to run pretty high oil temps. he said it gets to 130c at times. From looking at my other two manual cars, that does seem excessive. coolant temps don't seem to rise correspondingly though.
Any ideas why oil is getting so hot? or apparently so because of the oil temp gauge?
we'll try fresh oil and filter and monitor it.