Mike, I saw a picture of one of these a while back...do you have the actual unit in-hand? Any idea if that company is still around?
Yet another flasher was also used, the Road Runner ETRR00-P from Sound Off Signal:
This photo from an '89 CarCraft article shows it installed on the coil cover of an in-service '88:
All the indentical mounting and wiring holes for this unit are also present on the coil cover of my car. I'm not sure what other years used this one but I'm checking on the retired '88 EVOC car too as it has much of it's original equipment still intact.