http://www.ebay.com/itm/86-89-Nissan-Pa ... 0825209423
I found the MAF sensor above for your vehicle for $85.95 with free shipping made by Chandler Motorsports. Keep in mind a Nissan dealer is giving you a genuine Nissan part, which quality is typically excellant. It is very rate to have an issue with a brand new Nissan part. The #16078-12G00 is the correct Nissan part number for your vehicle. Aftermarket parts can vary greatly in price and quality and I know nothing of the quality of Chandler Motorsports parts, good or bad.
Rockauto has an Airtex/Wells brand new MAF sensor for $378, which is more costly than a genuine Nissan part you can get from an online dealer, such as
www.1stAAANissanparts.com. This is why it pays to shop arounds. So, what you have is a choice! You can pay almost $300 for a genuine Nissan part that you know is of good quality or gamble on the quality of a part that's made by an aftermarket company that's a fraction of the price.